Hi rooters! Here's a (maybe stupid) question from a quite new user. I have a TH2 histogram scatter plot, in which points follows quite well an exponential line. I need to check this hypotesis and to get the time constant. Using TH1::fit doesn't work as I would (if I defined a TF2 "y-[0]*exp(x/[1])" all the pad is filled with black points!). I've also tried to use TH2::GetCorrelationFactor(1,2) with a log scale along y axis. But I'm not sure of what this function really does (ROOT reference guide is sometimes too cryptic for me...), and it also look insensitive to the log scale. I vaguely know that things should be easier with TProfile histograms, but I don't know how to convert a TH2F in a TProfile. Could someone help me? Thanks in advance, Sara
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