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A fine_toacut is implemented for fitting timewalk function. The code is still not working. All the pixels somehow give 0 points for fitting.

The selection conditions in Tree->Draw() was not in the proper place. This is now done correctly in this iteration of the code. However, there is some issue with the axis range. The following error message on the terminal is displayed : "Error in <TCanvas::Range>: illegal world coordinates range: x1=0.000000, y1=-2.748352, x2=0.000000, y2=1.724871
Error in <TCanvas::RangeAxis>: illegal axis coordinates range: xmin=0.000000, ymin=-2.301030, xmax=0.000000, ymax=1.277549"

Code to refine the toa_cuts. Idea is to use a corase cut and plot toa vs voltage, do a gauss fit, extraxct gauss mean and sigma to refine fine_toacut before fitting with time walk function. The Tree->Draw() with selection condition is not yet working

The fir parameter t is limited to 10*t and now the values are decently well enough although chi2/ndf is terribly small 

Looping over irow and icol and not TTree for fitting and plotting, Correct values are coutted, but still print s255,255 for col, row in the fitparametrs.txt file

Code extended for all the pixels. Problem in saving the fit parameters. Col and Row always printing 255 255

The TP.root shows that 4 trees are merged. However, while scanning only the last tree entries are shown 

The entire pixel matrix is read, TGrpaherrors are fiited with timewalk function, fit parametrs written to an output file. 

Please do not get confused by the name of the file. The code performs a time walk fit to the data for a single pixel 

Please do not get confused by the name of the file. The code performs a time walk fit to the data for one pixel

Codes for plotting 2d distribution of bl, rms. The profile histogram and projections are also plotted together