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According to a study by Stephan Fegan done in the context of Fermi/LAT analysis, the best way to determine a butterfly diagram is to draw the envelope of the error ellipse of the model parameters. I implemented this method now in ctbutterfly. I also changed the output file, having now two columns giving as function of energy th minimum and maximum intensities.
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…gning the old best optimizer result).
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… csspec and complemented the copy constructor of cterror (the optimiser was not copied and intialised)
