Dear Rooters a question concerning the TH2::GetCovariance() method. The value retrieved of the covariance looks to be bin independent, but the GetCovariance() method gets the values of the various stats[7] elements (by means of the TH2::GetStats() )in a bin-dependent mode (in particular the x and the y value: they are the center-bin values). It looks like that a TH2 remembers the exact x,y coordinates of the data sample it is filled with, even though the data are shown 2D-binned. The same occurs for the Correlation Factor. what I'm missing? Cheers, Tommaso -- ----------------------- Dr. Tommaso Chiarusi Dipartimento di Fisica Universita' di Bologna INFN. Sez. Bologna Tel +39.051.209.5234 Fax +39.051.209.5269 -----------------------
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