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Fig. 3.


Top panels: extracted region of the VST mosaic of 0.34 × 0.34 square degrees around FCC 167 in r band (left), plotted in surface brightness levels (shown in the colour bar). High-frequency residual image obtained from the r-band VST image of FCC 167 (right). Lower panels: intensity profile (left), in the r band, in the outer regions of FCC 167. For R ≥ 10.2 arcmin, the galaxy’s light blends into the average sky level, which has a residual scatter of about 0.04 counts around the zero (continuous black line). Azimuthally-averaged surface brightness profiles of FCC 167 in the r band (right) derived from VST data (black points), compared with literature data from Caon et al. (1994) in the B band (green asterisks), transformed to r-band. The vertical dotted line (right panel) delimits the region where the light profiles are “flattened” due to the convolution effect with the point-spread function (PSF). The FWHM of the PSF is about 1 arcsec, which is the average seeing for FDS observations (see Table 1).

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