Hi, Rene, Again about PAW and ROOT compatibility... Recently I made some projections of 2d-histogramms, and noticed that in case of 2d-histogram with errors projected histograms in ROOT and PAW have different errors. I think PAW makes error calculation in this case more correctly than ROOT: ROOT actually calculates error bars without any respect to errors in original 2d-histogramm. Projection in PAW made by: PAW > prox 8399 PAW > hi/proj 8399 PAW > hi/pl 8399.prox Projection in ROOT made by: root [1] h8399->ProjectionX("_px",-1,-1,"e"); root [2] h8399_px->Draw(); May be important: I've used 2d-histograms with errs, produced via HBOOK package, then convert them into ROOT file by means of h2root utility. But I've checked the code of H2ROOT and there're lines that convert 2d-errors from PAW to ROOT... (ROOT-3.03/08 AFS-version for 7.2 redhat) Best regards, Stanislav.
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