Top left: Image created by subtracting the Mrk 1018 (AGN and host galaxy) model from the observed VIMOS image then dividing by the observed image. The x- and y-units are pixels and the spatial resolution is 0.205″ (179 pc) per pixel. The orientation is the same as Fig. A.2. The orange circle encloses 99.7% (3σ) of the total point-like PSF (based on reference star three). The values of the pixels show the fractional differences between the model and the science image (from −1.0 to +1.0, corresponding to a difference of ±100%). Top right: Image zoomed into the central region. The orange circle, again, indicates the 3σ limit of the PSF. The colour scale has been adjusted to a maximum of +0.15 and a minimum of −0.15 (±15%). Bottom: Distribution of the counts for pixels that fall within the 3σ limit of the PSF. The vertical red and purple lines indicate the ±1σ and ±3σ limits of the count distribution respectively. The 1σ level corresponds to deviations of ±0.06 (±6%).