How to find error bars of histogram data points from root file

Hi Everyone,
Happy New Year!

I want to find the error bars of data points in the x- and y- axes to plot a TGraph with error bars. Please suggest how can I calculate this from the root histogram (attached root file). In the attached root file I need error bars of “dN_dPt” histogram data points with a logarithmic scale on the y-axis.


ampt_test1000_output.root (14.6 KB)

Your histogram has errors bars:



to retrieve the error for one bin you can use GetBinError

Thank you @couet

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