Results of BeeP analysis for M 1 (Crab Nebula). See the caption of Fig. 7 for a full description. This is a non-thermal source and BeeP has reduced EST_QUALITY accordingly; the full likelihood is not able to find a reasonable value for the SED parameters, in particular the spectral index. The Free model fit does find parameters, since it is less constrained, but the high χ² value indicates a very poor fit.