Histogram base

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I am trying to write the TRSI indicator showing the SMA line as a histogram, and think I am pretty much done. The only problem is that the Histogram starts at 0. Can anybody help me, or tell me how to use the 50 line as a histogram base. I have searched for how to do it in the forum, but have not been able to find it.

Regards, Finn

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#property indicator_separate_window
#property  indicator_buffers 5

#property  indicator_color1  Blue   //Blanc
#property  indicator_color2  Red   //SRSI Line
#property  indicator_color3  Blue   //SMA Histogram Up
#property  indicator_color4  White //SMA Histogram Dn
#property  indicator_color5  Red   //SMA Histogram Dn


#property  indicator_width1  1
#property  indicator_width2  1
#property  indicator_width3  1
#property  indicator_width4  1
#property  indicator_width5  1


//-----------------Buffers----------------------------------------
double RSI[];
double SRSI[];          //SRSI Line (EmaOfRSI)
double TempEma[];       //Ema3OfEma3OfRSI14 (Needed for the next line)
double SMA[];           //SMA Line (Ema3OfEm3aOfEma3OfRSI14)
double DMA[];           //DMA Line (EmaOfEmaOfEmaOfRSI)

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   IndicatorBuffers(6);
   SetIndexBuffer (0,RSI);
   SetIndexStyle  (0,DRAW_NONE);
   SetIndexBuffer (1,TempEma);
   SetIndexStyle  (1,DRAW_NONE);
   SetIndexBuffer (2,SMA);
   SetIndexStyle  (2,DRAW_HISTOGRAM);
   SetIndexBuffer (3,SRSI);
   SetIndexStyle  (3,DRAW_LINE);
   SetIndexBuffer (4,DMA);
   SetIndexStyle  (4,DRAW_LINE);
   
  
   SetLevelStyle(STYLE_DOT, 1, Gray);
   SetLevelValue(0, 70);
   SetLevelValue(1, 60);
   SetLevelValue(2, 50);
   SetLevelValue(3, 40);
   SetLevelValue(4, 30);

   
  

   return(0);
  }


//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
{
   int i, limit;
   int counted_bars=IndicatorCounted();
   if(counted_bars>0) counted_bars--;
   limit=Bars-counted_bars;
//----
   for(i=0; i<limit; i++)
       RSI[i] = iRSI(NULL,0,14,PRICE_CLOSE,i);
       
   for(i=0; i<limit; i++)
       SRSI[i] = iMAOnArray(RSI,Bars,3,0,MODE_EMA,i);
       
   for(i=0; i<limit; i++)
       TempEma[i] = iMAOnArray(SRSI,Bars,3,0,MODE_EMA,i);
       
    for(i=0; i<limit; i++)
       SMA[i] = iMAOnArray(TempEma,Bars,3,0,MODE_EMA,i);    
       
       
   for(i=0; i<limit; i++)
       DMA[i] = iMAOnArray(SMA,Bars,5,0,MODE_SMA,i);
   
   
//----
   return(0);
  }
//+------------------------------------------------------------------+