Hi. I notice that the Project3D of TH3, which projects a 3D histogram onto 1 or 2 dimensions, uses the following type of constructor for it's lower dimensional histogram (here I present the 1d case of projecting onto the x axis): TH1D(name,title,nx,fXaxis.GetBinLowEdge(ixmin),fXaxis.GetBinUpEdge(ixmax)); Unfortunately, this does not allow for the original histogram to have variable width binning along the direction(s) being projected onto. In my application I was able to write some code to get around this, but I was wondering if there is some subtlety that does not allow this to be implemented in general. If there is no such problem, would it be possible to allow this feature in the future? Chris Roat
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