void plotting_with_err_bar()
{
	foreach (PageBase pg in Project.Pages)
	{
		if( pg.GetType()==EXIST_WKS )
		{
			Worksheet wks(pg.GetName());
			
			// define curves
			Curve crvMedian(wks, 0, 1);
			Curve crvMean(wks, 0, 2);
			
			// define error bars
			Dataset dsErrMedian(wks, 3);
			Dataset dsErrMean(wks, 4);
			
			GraphPage gpg;
			gpg.Create( "Origin.OTP" );
			GraphLayer gly = gpg.Layers( 0 );
			
			// add and format Median plot
			int iMedian = gly.AddPlot( crvMedian, IDM_PLOT_LINESYMB );
			DataPlot dpMedian = gly.DataPlots(iMedian);
			dpMedian.Curve.Symbol.Shape.nVal = 2;
			dpMedian.Curve.Symbol.Size.nVal = 3;
			dpMedian.Curve.Symbol.EdgeColor.nVal = 1;
			dpMedian.Curve.Line.Color.nVal = 1;
			
			// add and format Mean plot
			int iMean = gly.AddPlot( crvMean, IDM_PLOT_LINESYMB );
			DataPlot dpMean = gly.DataPlots(iMean);
			dpMean.Curve.Symbol.Shape.nVal = 2;
			dpMean.Curve.Symbol.Size.nVal = 3;
			dpMean.Curve.Symbol.EdgeColor.nVal = 0;
			dpMean.Curve.Line.Color.nVal = 0;
			
			// add error bars
			gly.AddErrBar( crvMedian,  dsErrMedian );
			gly.AddErrBar( crvMean,  dsErrMean );
			
			gly.Rescale(); // rescale
		}
	}
}