VST mosaic in the g band of the Fornax cluster inside the virial radius (see Fig. 1). The image size is about 9 square degrees. Black contours are the X-Ray emission from ROSAT (Paolillo et al. 2002). The X-ray contours are spaced by a factor of 1.3, with the lowest level at 3.0 × 10−3 counts arcmin−2 s−1. All ETGs studied in the present work (see Table 2) are labelled on the image. Galaxies marked with blue symbols have g − i ≤ 0.8 mag and g − r ≤ 0.4 mag (see Sect. 4 for details). North is up and east is on the left.
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