I have a .root file with 2 TGraphs in it. When I want to draw them from a macro, they look different than shown by TBrowser. Let’s see the Room temperature graph. As you can see on drawnbymacro.png there are some peaks around 1265x10^6 which should not be there (and TBrowser shows it correctly). I experienced this issue with ROOT 5 and 6 as well. A short code is attached which can reproduce the problem. Do you have any idea what causes this?