How to read the output file properly? specifically FitResults

Newbie
1

So I have a code that reads through data files, does some modifications then plots it into a histogram named “h0” and “h1” then I do a fitting on it with a function, I then write the results to a file so I can go back to them later. An example of the ending is written below.


    TFitResultPtr F0 = h0 -> Fit("function_0","S");
    TFitResultPtr F1 = h1 -> Fit("function_1","S");

    TFile f("histo_data_0.root","new");
    h0 -> Write();
    h1 -> Write();
    F0 -> Write();
    F1 -> Write();

A file named “histo_data_0.root” is spat out
I can then access the histograms again by doing

TFile f("histo_data_0.root")
Tbrowser browser

I then see a browser that contains my written histograms and the Fit results.
I can easily open the Histograms by double clicking them.
But I’m not sure how to actually get the Fit result values themselves
I’m trying to get something that would spit out this kind of information again, similar to when the code is initially ran.

 FCN=9057.64 FROM MIGRAD    STATUS=CONVERGED      41 CALLS          42 TOTAL
                     EDM=2.66151e-08    STRATEGY= 1      ERROR MATRIX ACCURATE 
  EXT PARAMETER                                   STEP         FIRST   
  NO.   NAME      VALUE            ERROR          SIZE      DERIVATIVE 
   1  p0           9.21807e+03   4.36240e+00   2.17487e-05   4.45622e-01
   2  p1           1.29468e+07   4.33733e+03   3.62802e-06   2.79289e+00

Any pointers?

Thanks

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ROOT Version: 6.22
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2

Some fitting tutorials like this one are using GetParameters to retrieve the fit parameters. Maybe you can some idea from them? In any case, I am sure @moneta can help you.