The real author:
The Range indicator calculates the range expansion index and displays the range of price change in the current bar.
This indicator was first implemented in MQL4 and published in Code Base at mql4.com on 18.10.2007.
Fig.1 The Range indicator
Translated from Russian by MetaQuotes Software Corp.
Original code: https://www.mql5.com/ru/code/1482
The "Day of Week" function is designed to determine the number of required month according to data of the week and the day of the week inside this monthMaxMinRange
Two histograms to define the current market situation