Hi, Everyone, I have a specific question to ask, anyone can help me? Suppose I have a ntuple(tree), it has the following leaves: nEvent //trigger number x //x coordinate y //y coordinate z //z coordinate prob //some Prob. based on x,y,z I want to draw a surface picure like this: x->y->Prob here I need to specify the trigger no.--nEvent, about z direction, it is a integrate. I tried this from treeViewer, it draw me a 3D picture, it is point based picture, I want a surface picture(more smoothly). I tried to put "Surf" into Gopt box, it does not work. Anyone can help me? Thanks a lot Kai YI
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