Heiken_Ashi_Ma lines

//+------------------------------------------------------------------+
//|                                               Heiken Ashi Ma.mq4 |
//+------------------------------------------------------------------+
//|                                                      mod by Raff |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2006, Forex-TSD.com "
#property link      "http://www.forex-tsd.com/"

#property indicator_chart_window
#property indicator_buffers 4
#property indicator_color3 Yellow
#property indicator_color4 Blue
//---- parameters
extern int MaMetod  = 1;
extern int MaPeriod = 3;
//---- buffers
double ExtMapBuffer3[];
double ExtMapBuffer4[];
//----
int ExtCountedBars=0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//|------------------------------------------------------------------|
int init()
  {
//---- indicators
   SetIndexStyle(2,DRAW_LINE, 1, 2, Blue);
   SetIndexBuffer(3, ExtMapBuffer3);
   SetIndexStyle(2,DRAW_LINE, 1, 2, Yellow);
   SetIndexBuffer(3, ExtMapBuffer4);
//----
   SetIndexDrawBegin(0,5);
//---- indicator buffers mapping
   SetIndexBuffer(2,ExtMapBuffer3);
   SetIndexBuffer(3,ExtMapBuffer4);
//---- initialization done
   return(0);
  }
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//---- TODO: add your code here
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   double maOpen, maClose, maLow, maHigh;
   double haOpen, haClose;
   if(Bars<=10) return(0);
   ExtCountedBars=IndicatorCounted();
//---- check for possible errors
   if (ExtCountedBars<0) return(-1);
//---- last counted bar will be recounted
   if (ExtCountedBars>0) ExtCountedBars--;
   int pos=Bars-ExtCountedBars-1;
   while(pos>=0)
     {
      maOpen=iMA(NULL,0,MaPeriod,0,MaMetod,MODE_OPEN,pos);
      maClose=iMA(NULL,0,MaPeriod,0,MaMetod,MODE_CLOSE,pos);
      maLow=iMA(NULL,0,MaPeriod,0,MaMetod,MODE_LOW,pos);
      maHigh=iMA(NULL,0,MaPeriod,0,MaMetod,MODE_HIGH,pos);

      haOpen=(ExtMapBuffer3[pos+1]+ExtMapBuffer4[pos+1])/2;
      haClose=(maOpen+maHigh+maLow+maClose)/4;
      
      ExtMapBuffer3[pos]=haOpen;
      ExtMapBuffer4[pos]=haClose;
 	   pos--;
     }
//----
   return(0);
  }
//+------------------------------------------------------------------+