pOH

#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1 Red
double ExtMapBuffer1[];
int ExtCountedBars=0;
extern int lookback = 0;
int init()
  {
   SetIndexStyle(0,DRAW_LINE, 0, 1);
   SetIndexBuffer(0, ExtMapBuffer1);

   return(0);
  }
int start()
  {
   int i=Bars-ExtCountedBars-1;
   int x = 0;
   while(i>=0)
     {
      if(x == 0){
      ExtMapBuffer1[i] = Close[i+lookback];
      x = 1;
      }
      else{
      x = 0;
      ExtMapBuffer1[i] = Open[i+lookback];
      }
 	   i--;
     }
   return(0);
  }