main or single line.

[samjesse]

      stoHandle = iStochastic(_symbol, _period, 14, 3, 3, MODE_SMA, STO_CLOSECLOSE);  //--- create indicator handle
      //--- Get Stochastic indicator data in an array stochBuffer []
      copied=CopyBuffer(stoHandle, 0, 0, bars, stochBuffer);

does it copy the Main or the Single line of the indicator?

[Enivid]

Main. For Single line call:

CopyBuffer(stoHandle, 1, 0, bars, stochBuffer);