Hello! I have a tree which I use to produce a second tree with a different number of entries, for example looping over events in the first and then tracksxevents in the second. Currently if my histograms take 100 seconds to make and I want 10 of them then I am waiting 1000 seconds since Draw appears to do a seperate loop for each plot. This is much slower than sticking to the first tree, do one loop and fill the histograms as you go. Is there a neat way to link histograms together using TTree so that I don't have to wait for 10 loops, or is it necessary to use MakeClass? Martin
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