TH1 vs TGraph pol0 Fit

Roottalk,

When I create a histogram and a graph with the same data (see attached script) and fit them both to the 'pol0' function the fit results are very different. My results are pasted below. I tried fitting a 'pol1' and both fits yield identical results.

Is this the expected behaviour? If so then please explain?

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• W E L C O M E to R O O T *
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• Version 4.04/02 4 May 2005 *
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• You are welcome to visit our Web site *
• http://root.cern.ch *
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FreeType Engine v2.1.3 used to render TrueType fonts. Compiled for linux with thread support.

CINT/ROOT C/C++ Interpreter version 5.15.169, Mar 14 2005 Type ? for help. Commands must be C++ statements. Enclose multiple statements between { }. root [0] .x fitpol0.C

• Histogram Fit... *********** Fitting results: Parameters: NO. VALUE ERROR 0 0.009349 0.015288
  • Graph Fit.... ************ Fitting results: Parameters: NO. VALUE ERROR 0 0.020500 0.158114

Thanks,
Dylan