Let me rewrite this, I did a couple type errors. Hi all, I have two histos in a file (let's say h1 and h2) and I want to add into an element of an array of histos, let's say SUM[2][3]; No problem, I do: TH2F SUM[10][10]; SUM[2][3]=(*h1) + (*h2); But when I do SUM[2][3]->FitSlicesX(0,0,0,1,"") this will create h2_0 (h2 is the last histo to be summed). Is this ok? Maurizio
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