Comparison of a subset of ten observed and modelled images. The selected observed images are marked with a † in Fig. 1; here we keep the same numeration. For modelling purposes, those images labelled with an “*” were rebinned ×2 with respect to the values given in Table 1. The isophote levels in SDU in each case are: (1†) 0.5 × 10⁻¹⁴, 1.0 × 10⁻¹⁴, 2.0 × 10⁻¹⁴ and 6.0 × 10⁻¹⁴. (7†,*) 1.7 × 10⁻¹⁴, 3.0 × 10⁻¹⁴, 7.0 × 10⁻¹⁴ and 2.0 × 10⁻¹³. (10†,*) 4.0 × 10⁻¹⁴, 7.0 × 10⁻¹⁴, 1.2 × 10⁻¹³ and 4.0 × 10⁻¹³. (11†,*) 4.0 × 10⁻¹⁴, 7.0 × 10⁻¹⁴, 1.2 × 10⁻¹⁴ and 4.0 × 10⁻¹³. (18†,*) 4.0 × 10⁻¹⁴, 7.0 × 10⁻¹⁴, 1.2 × 10⁻¹⁴ and 4.0 × 10⁻¹³. (21†,*) 4.0 × 10⁻¹⁴, 7.0 × 10⁻¹⁴, 1.2 × 10⁻¹⁴ and 4.0 × 10⁻¹³. (24†,*) 4.0 × 10⁻¹⁴, 7.0 × 10⁻¹⁴, 1.2 × 10⁻¹⁴ and 4.0 × 10⁻¹³. (25†) 4.0 × 10⁻¹⁴, 7.0 × 10⁻¹⁴, 1.2 × 10⁻¹⁴ and 4.0 × 10⁻¹³. (30†) 1.7 × 10⁻¹⁴, 3.5 × 10⁻¹⁴ and 9.0 × 10⁻¹⁴. In all cases, the black contours correspond to observations and the red ones to the model. The black vertical lines correspond to 2 × 10⁴ km in the sky plane, and the y and x axes are given in pixels.