Summary of the Expert Advisor This EA will trade using standard MT4 indicators such as Moving Averages, MACD, RSI, Bollinger Bands, and so on. The EA was made so that these indicators can be mixed or matched so a number of possibilities can be traded with. Each indicator can be enabled or disabled and many settings are adjustable for each indicator. There are also other features included like multiple time frame capability and money management. As a result, many different trading strategies can
Scalping strategy that uses one order on EURUSD М15 (can also be applied to М5 and М1, but with different settings). The product has been tested on the entire history from 01.01.1999 to 01.02.2014. The robot is sensitive to spread. It should be used only on ECN accounts with spreads not exceeding 2 (5 digits). In the source data, N is a deposit load (for USD account currency and the leverage of 1:100). I recommend to use N=2.5 and not exceed it over 5 for comfortable trading. Input parameters:
This indicator allows you to trade based on the following signals: The green line goes up - we buy on the second bar; the green line breaks downwards - we close the buy position. The red line goes down - we sell on the second bar; the red line breaks upwards - we close the sell position.The indicator can be used for trading independently or as an additional filter. It shows good results on senior time frames from one hour and up. I use it in some Expert Advisors.
This indicator is developed based on the standard Accelerator Oscillator, enhanced with variables for changing the period of moving averages, which expands its functionality. The use of the indicator is similar to the standard iAC. It can be used for trading independently or as an additional filter. The indicator operates on lower time frames from 15 minutes and less or as an additional filter on senior time frames. I use it in some of my trading systems.
Description Fibo Levels is an indicator that automatically plots Fibonacci levels. The levels are calculated and plotted over a certain interval using the number of bars specified by the user. When the price achieve one of the target levels (23.6%, 38.2%, 50% or 61.8%) the indicator at the request of the user gives a sound signal and/or sends the message by e-mail. Example of the e-mail notification: Subject: Fibo Up Signal Message: Signal,H1 - Correction of EURUSD reached
A moving average is commonly used with time series data to smooth out short-term fluctuations and determine longer-term trends. The proposed indicator has an ability to increasing a smooth-effect. This indicator could play an important role in determining support and resistance. An input parameter nPeriod determines number of Bars for Moving AboveAverage calculation.
Efficient and non-repainting Pin Bars pattern detector indicator with the following abilities. I called it efficient as I personally tried each pin bar detector (available online) when developing an Expert Advisor for a client but no pin bar detector was able to give correct signal. Can detect pin bars in any currency pair and in all time frames. Ability to change color and size of detecting points (smiley faces). Ability to change the distance offset of the smiley faces from the ca
A very good HUD which can give following information about current currency chart: Current Candle Range in pips; Current Candle Body in pips; ATR value of any time-frame you want in pips; Spread in pips; GMT Time; Price (if the color is red, it means that the price is decreasing; green means increasing).You can change the HUD corner, color, font size, ATR Period, ATR timeframe and GMT Offset from Broker Server Time with following input variables provided: ATRTimeFrame - select a timef
iRobot Intellect automatically performs trading in МetaТrader 4 terminal. The Expert Advisor strives to conduct accurate market entries, though the number of performed deals per day is low. That leads to a small drawdown allowing traders to increase the lot size at their discretion. The Expert Advisor's feature is performing technical analysis on four timeframes. The trading robot's algorithm contains price and risk analysis blocks decreasing the load on the deposit in some moments of trading. T
Alex Profis is a fully automated Expert Advisor for Forex trading. The EA uses the strategy based on price levels' breakout. The main rule of the EA is to preserve and increase the account balance without large risks. Therefore, the EA is in the market for mere minutes, sometimes seconds per day. The best results are achieved on GBP/USD, EUR/USD, USD/JPY. The EA works on H1. The product requires a low-spread broker with accurate order execution. Real account monitoring: https://www.mql5.com/
I am happy to offer you my new upgraded Expert Advisor that trades ON NEWS and ON EVENTS that have a strong influence on the market, but do not occur on schedule! The EA opens trades in case of a sudden price change in any direction and closes them automatically with the profit that you wish. And we all know how often the price changes when a "successful" news appears, how far it can go up or down. Also, this robot protects your deposit by placing SL with customizable parameters. This EA can b
A form of technical analysis based on the ideas that the market is geometric and cyclical in nature. A Gann Fan consists of a series of diagonal lines called Gann angles, of which there are nine. These angles are superimposed over a price chart to show a security's support and resistance levels. The resulting image is supposed to help technical analysts predict price changes. Although once drawn by hand, today Gann Fans can be drawn with software programs. This indicator draws Gan
This indicator implements the "Awesome Oscillator" operation principles and shows us the current market force situation. It uses the same trading principles but differs from АО in that it has three calculation methods: 1 - classical, 2 - classical without lag and 3 - calculation as a digital filter. Method #3 is the "fastest" one and is interpreted differently from the classical AO. The indicator also displays "classic divergence" and "reverse divergence". The line of the last "reverse divergenc
The Synchronized Charts script allows comparing bars of different symbols or different periods of the same symbol. Attach the script to a chart and move bars or change the scale, all opened chart will move synchronously with the current one. The bars on different charts aligned to the border according to their open time. Please be sure the relevant history datas have been downloaded before synchronize charts. The free demo version is: https://www.mql5.com/en/market/product/31242
Fibonacci SR Indicator This indicator creates support and resistance lines. This indicator is based on Fibonacci Retracement and Extension levels. It will consider many combinations of the Fibonacci levels and draw support/resistance lines based on these. This indicator uses tops and bottoms drawn by the ZigZag indicator in its calculations. The ZigZag can also be drawn on the chart, if necessary. The indicator considers many combinations of past reversal points and Fibonacci ratio levels, and
The Happy Buyer Expert Advisor trades intraday pending orders using a small number of trades and only two optimizable parameters. Lot - fixed lot value. FreeMarginPercent - percent of free margin for the calculation of lot size. If it is equal to 0, the fixed lot is used. DeltaTP – Take Profit value. DeltaSL - Stop Loss value. ShortTrade – short positions allowed (only for testing). Working symbol - EURUSD. Working time frame - M5. Historical data on D1 is required. Furthermore, you ne
The CAP Joly Scalper EA is a price action scalper that trades tick data aggressively with reversal trade strategy. It can be use as scalper or non-scalper(Active Hedge Mode). However, it is recommended to trade only low-spread and liquid Forex pairs. It also has option to stop trading before important news releases to avoid slippage and spread widening. Uses fixed stop loss and trailing stop of profitable trades in its operation. Is optimized using real ticks with 99.90% model quality. This EA i
The indicator allows traders to apply any symbol and timeframe chart to the current one (so that two or more charts are displayed in a single window). The applied chart can be shifted by time and price axes (auto or manual shift according to the settings). The indicator can also display open orders on selected pairs (open, stop loss and take profit levels). Settings Symbol_ = EURUSD - applied currency pair symbol. Period_ = 15 - timeframe; if = 0, the current chart's timeframe is used. C
This EA uses two main strategies on EURUSD: First strategy based on ATR/ iMACD indicators. Second strategy based on Bollinger bands, iMA and Divergence indicators.Other features: Spike trading on both strategies (customizable spike pips size). Auto trailing stop at the middle of the last candle (customizable StopLoss and Trailing Threshold).
GoilerEA Pro is based on ForexGoiler indicator algorithm. First of all, this Expert Advisor will be of interest for traders using this indicator in their activity. However, it can be used by anyone, as the trading algorithm is clear enough and can be mastered if necessary. GoilerEA Pro is a fully automated system. After you have configured and installed it in the terminal, you only need to keep an eye on its operation from time to time. ForexGoiler indicator code has been integrated to the Ex
This indicator forms a signal for opening a buy or sell order. It is based on the analysis of the situation at the crossing of two moving averages with different periods (set by the values of WavePeriod and AvgPeriod variables). The indicator is designed to be used on Н1 time frame. It can also work on higher and lower time frames, in which case it is advisable to run the optimization and use the more appropriate values of WavePeriod and AvgPeriod variables, rather than 10 and 21, respectively,
The indicator gives signals on trend reversal or the possible direction of price movement when leaving the flat movement. Features and settings: Sensitivity = 3 - sensitivity from 1 to 5; the higher the value, the more signals (example displayed in the screenshot below).DeepBars = 3000 - indicator display depth. ZeroBarCalc = false - use a zero bar in the calculations; if yes, the signal will appear earlier, but it may disappear before the current candlestick is closed. UseAlert = false -
Expert Advisor Plan B4 is based on analyzing of price action. Positions are closed when opposite signals appear. Input Parameters Period - number of bars to be analyzed; Mode - operation mode of the Expert Advisor (0-11); Fixed Lot - fixed lot value; Variable Lot - variable lot as a percentage of the free margin.The screenshots demonstrate the backtesting results. The Expert Advisor was tested on EURUSD M30 in the "Every tick" mode from 07.01.2013 to 08.02.2014. The Expert Advisor was
MetaTrader 4 Wolfe Wave Indicator draws Wolfe Wave in fully automated mode. Benefits We do not use ZigZag and work with fractals. Our indicator can recognize all Wolfe Wave patterns on specified time range. So we check every top for potential 1,2,3,4,5 points not only ZigZag tops. Indicator has a lot of adjustable parameters.
George’s Trend is an Expert Advisor that follows trend following logic. It was designed with the old trader’s axiom "The Trend is Your Friend". The name "George’s Trend" arose from the fact that a MetaTrader Expert Advisor is essentially a trading robot and I decided to personalize the robot I was designing by giving him the name George. George does not wish to be in the markets at all times. His mission is to locate when a trend is occurring in the market’s direction and follow it for a
Expert Advisor Pipsburger 4 is based on analyzing the price action. Positions are closed when opposite signals appear. Input Parameters Period - number of bars to be analyzed; Lifetime - minimum time of the position life in bars; Mode - operation mode of the Expert Advisor (0-80); Fixed Lot - fixed lot value; Variable Lot - variable lot as a percentage of the free margin.The screenshots demonstrate the backtesting results. The Expert Advisor was tested on EURUSD M30 in the "Every tick"
A script for opening a grid of orders If you need to quickly open several pending orders (Buy Limit, Sell Limit, Buy Stop, Sell Stop) on a certain distance from the current price, this script will do all the routine for you! Allow AutoTrading before running the script. Usage: Run the script on a chart. Input Parameters: Language of messages displayed (EN, RU) - language of the output messages (English, Russian). Price for open - open price. If set to 0, the orders will be p
The Get_PA Expert Advisor trades using the Price Action patterns (pin bar and outside bar). Parameters of the Expert Advisor: slippage - the maximum slippage in points for deal opening or closing. magic - the magi number to identify deal. lot - volume per deal. profit - take profit in points (0 - disabled). loss - stop loss in points (0 - disabled). trail - trailing in points (0 - disabled). pivot_sell - the price level, above which the EA will sell. pivot_buy - the price level, below
Two in one - Roly Poly plus Ilan! The two most popular strategy with the elements of martingale are combined in one Expert Advisor and can operate together or separately. The parallel trading of these two strategies can significantly improve profitability and reduce risks in general due to the mutual hedging between the strategies. Each of the two strategies performs well in certain market conditions, allowing to use the best of a variety of market conditions and to significantly reduce the ris
The iRobot-MatriX Expert Advisor is developed for gaining profit in the Forex market by trading based on the vortex trading strategy. The robot first finds the main trend on M5 time frame and then trades the pullbacks in the trend. It can average all deals with a positive total or move to breakeven using Trailing Stop. The main indicator used by the Expert Advisor is MACD in several variations. Based on its data, we determine the price momentum. It also features risk minimization based on the d
Logarithmic Network - cm-hourglass Expert Advisor The Expert Advisor places orders with a decreasing lot and step in the direction of the trend and with an increasing lot and step in the counter-trend direction. It sets Take Profit for every direction to avoid breakeven of the entire series. The farthest order in the direction of the trend is closed with a farthest counter-order so as to get the positive total, thus pulling the entire network to the price without letting it expand. Parameters
WS Tik Size indicator evaluates the tick price action size and tick's directional movement simultaneously. WS Tik Size serves purpose of finding very accurate reversals from large institutional sized orders. The purpose is to maximize profits if in a position and exit on Large Tick size. The blue histogram represents the bullish impulse The red histogram represents the bearish impulse The Yellow Cross represents the current impulseThe trading implications are straightforward You can buy
This is an adaptive channel scalper using Donchian channel with dynamically changed period. The Expert Advisor works well with traditionally flat pairs: AUDNZD, EURCHF, EURGBP, AUDCAD, etc. Trading by time is provided in the Expert Advisor's settings. For example, you can trade only during Asian and American sessions. The product contains protection against an increased spread, which can expand during a rollover and news releases. Also, there is a protection against reducing the leverage on
This indicator is using classical indicators: Average Directional Movement Index from the higher TF (which you can set up using input parameter TimeFrame). Yellow line represents the Main Average Directional Index from the senior TF. Green line represents the Plus Directional Indicator (+DI) from the senior TF. Red line represents the Minus Directional Indicator (-DI) from the senior TF. Green histogram represents Up trend. Red histogram represents Down trend.
Intel trade Expert Advisor is based on technical indicator system using Stochastic oscillators on several timeframes. Analyzing trends on three-four charts simultaneously, it finds the price impulse. The operation is performed using Buy and Sell market orders. The entry is performed according to the trading strategy requirements. Only one trading order can be opened simultaneously. Closing is performed using Take Profit, Stop Loss and Trailing Stop. Expert Advisor type: short-term. Deposit:
Features Simultaneous Multi-Signals, Multi-Symbols and Multi-Timeframes. Please message me for ALL settings. I am constantly seeking new signals and improving old ones to maintain and improve the edges in my updates to this EA Extraordinarily robust (wide range of settings produces positive results over long testing periods during optimizations and across different broker feeds and timeframes) Built-in anti-curve fitting features for extremely robust optimizations (Time Dilation te
MTF Moving Averages indicator with overbought and oversold zones. Two display options - as a line and as a histogram. A series of OBS (overbought and oversold) indicators - these are indicators that have been enhanced with overbought and oversold zones. Another feature of this indicator is that the lines of the indicators (when analyzing several indicators in a single window) are not redrawn relative to each other when scrolling the chart.
About the system: RUSH is an automated indicator-free system. The Expert Advisor starts trading in small orders in both directions at once. As the price moves, counter-orders are opened at a certain distance. Recommended minimum deposit: For Standard Forex accounts - 2,000 USD with the minimum lot of 0.01. For Mini Forex accounts - 200 USD with the minimum lot of 0.01. For Micro Forex accounts - 20 USD with the minimum lot of 0.01. Parameters: Lot = 0.1 - Lot for initial orders. Prof
The indicator allows determining the strength and direction of the trend precisely. The histogram displayed in a separate window shows changes of the slope of the regression line. A signal for entering a deal is crossing the zero line and/or a divergence. The indicator is also useful for wave analysis. Input Parameters: Period - period of calculation, 10 on default; Angle threshold - slope at which a flat is displayed, 6.0 on default (within the range from -6.0 to 6.0); Filter by vol
The indicator plots horizontal support and resistance levels using grouping of extrema. The levels are displayed as lines whose color depends on how many times the level was a support or resistance line over the specified interval. You can also display counters for support, resistance and age of the level in text format. The age of the level indicates how many bars back the level had the most recent impact on the price (on the chart time frame as specified in the settings). Given the age of the
This Expert Advisor is catching a trend change situation and makes orders according to the new trend. Input parameter nPeriod is used as a number of Bars where catching of trend occurs starting from the current Bar. Using StartHour and EndHour ones can limit the daily time frame for possibility of opening positions. TP, SL and TrailingStop are self-explanatory input parameters. UseMM is a Money Management system. If UseMM = true, then the EA will calculate the LotSize as a PercentMM from A
The indicator is an inter-week hourly filter. When executing trading operations, the indicator allows considering time features of each trading session. Permissive and restrictive filter intervals are set in string form. The used format is [first day]-[last day]:[first hour]-[last hour]. See the screenshots for examples. Parameters: Good Time for trade - intervals when trading is allowed. Bad Time for trade - intervals when trading is forbidden. time filter shift (hours) - hourly shift
The Expert Advisor Pathfinder 4 uses data provided by three moving average indicators. Positions are closed when opposite signals appear. Input Parameters First MA Period - period of the first indicator; Second MA Period - period of the second indicator; Third MA Period - period of the third indicator; MA Method - method of averaging for the indicators; Mode - mode of operation of the Expert Advisor (0-7); Fixed Lot - fixed lot value; Variable Lot - variable lot as a percentage of t
This is a very complex Expert Advisor based on several indicators and multiple relations between them. That is a rare thing in Forex market. Let's explain it in several lines: Full Automated Expert Advisor Semi-Scalper ROBOT Up To Date Every Markets Condition Best Money Management Safe Stealth Mode 24 Hours 5 Days Markets Medium Stop Loss Compatible With 4 And 5 Digits Brokers NFA Compliance Based On Several Indicators, Several Relations Between Them And Sevaral strategies Insid
A script for closing positions If you need to quickly close several positions, but it requires specifying maximal deviation and the number of attempt to close, this script will do all the routine for you! Allow AutoTrading before running the script. Usage: Run the script on a chart. Input Parameters: Language of messages displayed (EN, RU) - language of the output messages (English, Russian). Magic - 0 means ignoring magic number, other wise it will use the specified magic numbe
A script for closing positions If you need to quickly close several positions, this script will make all the routine for you! The script does not have any input parameters. Allow AutoTrading before running the script. Usage: Run the script on a chart. If you need to specify the maximal deviation and the number of attempts to close positions, use the script with input parameters https://www.mql5.com/en/market/product/2783 You can download MetaTrader 5 version here: https://www.mql5.com/en/m
Script for deleting pending orders If you need to delete all pending orders you placed, this script will do it for you! It doesn't have any input parameters. Allow AutoTrading before running the script. Usage: Run the script on a chart. If you need a possibility to adjust parameters of the script, use the version with input parameters https://www.mql5.com/en/market/product/2785 You can download MetaTrader 5 version here: https://www.mql5.com/en/market/product/626
Script for deleting pending orders If you need to delete all pending orders you placed, this script will do it for you! Allow AutoTrading before running the script. Usage: Run the script on a chart. Input parameters: Language of messages displayed (EN, RU, DE, FR, ES) - language of messages displayed (English, Russian, German, French, Spanish).Use Magic: (0 - ignore Magic, else - only this Magic) - if set to zero, the magic number is not considered. Otherwise the script deletes only orde
Classic Swing Expert Advisor Advantages: No potentially dangerous trade methods used: martingale, grid, waiting out losses, etc. Resistant to over-optimization. Reliable protection of deposit with predefined stop losses, breakeven and close at the end of day functions. Only one open position at a time. Trading with pending orders to decrease the risk of slippage. Simple "plug and play" - download and trade!Adjustable Parameters: Lot - fixed lot value. FreeMarginPercent - percentage va
Scalping strategy indicator only for M1 timeframe, works with any pairs. Whenever you have time to sit down at your PC or laptop, you can get profit during 15-30 minutes with the help of this indicator. Red line means down trend, you need to sell. Blue line means up trend, you need to buy.Note! Before you start a trade process, it is very important to wait out a new signal.
"Angle MAs all types" is a MetaTrader 4 indicator which reports the angle formed with a horizontal line and a moving average. It allows selecting MA method to use, period, price and the number of bars on which the angle is calculated. The angle is calculated from your tangent (change of price per minute). You can select 10 types of MA, 4 standard in MetaTrader 4 (SMA, EMA, SMMA, LWMA) and 6 non-standard (DEMA, TEMA, LRMA, HMA, AMA, FRAMA). General Parameters: Period MA: To defined the numbe
Unique Scalper strategy, no Martingale, no Hedging, no Grid! The function of this Grail Expert Advisor is similar to that of Million Dollar Pips EA. This is a completely automated Forex system. Trading is performed with as lowest possible risk as possible. You can use the product on EURUSD and GBPUSD pairs on M15 timeframe. This Expert Advisor works on ECN or low spread account (no more than 2 pips).
Multicurrency indicator Any chart obs is a price chart with a percentage scale. Can be displayed as a line and as a histogram. There is also a reverse function available, it mirrors the chart. The name of an instrument to be displayed is specified in the input parameters, the current symbol is used on default. The indicator doesn't have lags as it is not smoothed with any formulas, but bound to a percentage scale, what allows detecting the price equilibrium, the overbought and oversold state.
It seems logical to know when a trade will have the most profit potential. Why waste time trading in less than ideal conditions? This leading indicator provides a detailed analysis of the price movement of a currency, but more importantly.... it extrapolates price movement for the next 24 periods of the chosen timeframe to come. PrimeTime's sophisticated algorithm considers each individual period and determines future price activity with a respectable degree of accuracy. Using PrimeTime you w
Multi-timeframe version of the standard Commodity Channel Index indicator. Input Parameters: Symbol - currency pair to calculate CCI value: please type the currency pair exactly as it is seen on the chart. Usually, it should be written in bold and sometimes it has point "." or x at the end. You can use this option in order to compare the values of two currency pairs on the current chart. See the screenshot: one of the indicators is used as a default one. TimeFrame - used time frame: it can
Zeus Expert Advisor has been developed for cautious, conservative traders. It does not use risky algorithms and strategies like Martingale, waiting in drawdown. All transactions always have stops, which are gradually decreased as the price moves in favorable direction. It will open near 50 transactions per year, and never more than one at a time. EA is set up to work with GBPJPY H4. Key features: No risky algorithms (no martingale, no grid, no averaging). No scalping, average deal exce
This indicator is using 2 classical indicators: Commodity Channel Index from the higher TF (which you may change using input parameter TimeFrame) and Average True Range from the current TF. The Green ribbon indicates the upper trend and the Red ribbon indicates the down trend. Buy when the Yellow line crosses the Upper bound (Aqua line). Sell when the Yellow line crossover the Lower bound (Aqua line).
This is a fully automated trading system based on trend predictions. Take Profit (hidden from a broker) is calculated in real time and depends on the market volatility. For filtering signals, the Expert Advisor uses "Hist_StepMA_Stoch_KV1_Ex_02". It should be used on GBPJPY on M30 timeframe. No manual trading is allowed on account that uses this Expert Advisor. Parameters: Risk - money management in % MaxLots - maximum allowed lot to trade slippage_open - slippage on opening position s
The input parameter counted_bars determines on how many bars the indicator lines will be visible. The input parameter barsNum is the period for bands calculation. When PriceClose for previous bar is above upper band a Long position may be opened. When PriceClose for previous bar is under lower band a Short position may be opened. If the current Price is between bands it is time to wait.
Kaufman Adaptive Moving Average (AMA). It is not available among the standard МetaТrader 4 indicators. In addition to the 6 standard calculation modes, the seventh one at (Open+Close)/2 price has been added. Added selection of a smoothing method for a moving average used in the calculation of the efficiency rating (ER). Trend filter options: in points or by "deviation". Added an option for shifting the indicator to the left/right. You can also choose the character of the direction arrow. Param
Intraday trading system based on breakouts of GBPUSD "round" price levels. The product's feature is the algorithm of analysis and filtration developed for reducing the probability of false breakouts. Customizable System Parameters: Lot - fixed lot value. FreeMarginPercent - percentage value of available funds for calculating the working lot. If it is equal to 0, a fixed lot is used. DaysToAnalyze – number of trading days used for analysis. DeltaIn - distance from the “round” level, a pen
Multi-timeframe version of the standard Relative Strength Index indicator. Input Parameters: Symbol - currency pair to calculate RSI value: please type the currency pair exactly as it is seen on the chart. Usually, it should be written in bold and sometimes it has point "." or x at the end. You can use this option in order to compare the values of two currency pairs on the current chart. See the screenshot: one of the indicators is used as a default one. TimeFrame - used time frame: it can
PZ Lopez Impulse indicator evaluates volatility and price directionality simultaneously. It is an extremely easy to use indicator. The blue histogram represents the bullish impulse The red histogram represents the bearish impulse The gray histogram represents the current volatility The moving average is the average volatilityThe trading implications are straightforward. You can buy when the bullish impulse exceeds the average volatility (blue histogram > moving average) You can sell wh
Adaptive channel scalper using MA and dynamic channel. The Expert Advisor works well with traditionally flat pairs: AUDNZD, EURCHF, EURGBP, AUDCAD, etc. Trading by time is provided in the Expert Advisor's settings. The product contains protection against an increased spread, which can expand during a rollover and news releases. Also, there is a protection against reducing the leverage on Friday. The Expert Advisor is set for AUDNZD M15. Trading is performed 24 hours a day. WidthFactor -
This is an unusual (visual) representation of the famous WPR indicator. Instead of a separate subwindow, it is displayed in the main chart as a channel and levels. In addition, this indicator features a possibility of smoothing its values using a moving average. Parameters PeriodWPR - calculation period of the percent price channel LevelUp - the value of the upper level in percentage (negative) LevelDn - the value of the lower level in percentage (negative) Center - the value of the centr