Overview showing the best-fit variable B-field model and the observed data in the IC regime, in five different energy bands. Each panel displays a 1° ×1° cutout around the position of the Crab Nebula. The first column gives the best-fit model prior to folding with the IRFs. The second column illustrates the predicted number of events based on source and background models (folded with the IRFs), smoothed with a top-hat kernel of 2.4′ radius. The third column shows the observed number of events with the same smoothing. Finally, the fourth column displays residual significance maps (see main text for details).