Dear rooters, I have encountered the following "unexpected" beaviour of a TH1F histogram: I create a TH1F object and fill it with a set of (x,y) data points, the y coordinate being used "as a weight". I find that, as long as the minimum among the y values is negative, the vertical axis range is automatically set centered on the y values Instead, if the minimum among the y values is positive (no matter how big it is), the vertical axis first value is always set to 0. !! Below I pasted my test program, just try to switch OffSet between +10. and -10. Is this the way it is supposed to work? ...or am I missing something ?? How I can have the vertical range centered on y values also in the second case?? Thank you, Irene
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