Hi Tony, Take a look at "void TGraph::PaintGrapHist" and scan for "lowRes". You will see around line 2350 that if you draw the graph with option L or P, The number of data points is checked versus your screen resolution. In case of many data points it will not draw every point but just calculate the average pixel position. 10^7 should not be a problem Eddy A.J.M. Offermann Renaissance Technologies Corp. Route 25A, East Setauket NY 11733 e-mail: eddy@rentec.com http://www.rentec.com
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