Efficiency in bins of number of tracks

Hello! Can someone tell me how to set up the color range for a 2D histogram (TH2F). I know that the height of the bins is between 0 to 1 and I want to set the limits and the colors to be used. Can anyone help me? (I am sorry if the question is too silly but new to ROOT). Thank you!

Does tutorials/graphics/palettes.C help?


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