Fix Fermi catalog flux points upper limits #1026
This PR fixes the Fermi-LAT flux points upper limit computation. When plotting Fermi-LAT spectra and flux points I noticed, that the flux upper limits where not compatible with the ones I computed myself.
In addition I removed that the
cdeil left a comment
OK to merge.
(You only show an example plot for 3FGL compared to Gammapy. You could also compare to example SED plots given in the other catalog papers to make sure it's now really OK for all Fermi catalogs.)