Study of background scaling in the Crab spectrum at different energies with varying energy binning, similar to Fig. 6. Bottom panel: AIC as a function of energy. From the optimal AIC at each energy bin, the flux is determined (black data points, upper panel, left axis). The fitted background is shown as a grey histogram, divided into continuum (blue) and line (green) contributions (upper panel, right axis). The black data points are fitted by a power-law continuum, either only using the 50–100 keV range (pink band), only the 1790–1840 keV range (yellow band), or all four ranges together (red band).