NGC 4472. Zoom (37 × 35 arcmin) of the median-smoothed residual image. The outermost elliptical contour marks the region where the b-model subtraction was not applied. The superimposed white contours are 1) the tail connecting UGC 7636 to the giant ETG; and 2) shells and fan of material identified by Janowiecki et al. (2010) and Arrigoni Battaia et al. (2012) that is visible in our residual image. The wave-like residuals, concentric with the NGC 4472 nucleus, are spuriously introduced by the numerical procedure.