Same as in Fig. 4, except that data are smoothed (via the LOESS algorithm, see text) for regions of S/N < 20 in the upper two panels and for all regions in the lower two panels. Moreover, the black surface brightness contours here show the V-band residual map, ranging from 22 to 26 mag arcsec−2 in steps of 0.5 mag arcsec−2, after the subtraction of maximum symmetric models from the two central galaxies NGC 3311 and NGC 3309 (Arnaboldi et al. 2012). In all panels, north is up and east is left.
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