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Fig. 1.


Distribution of galaxies within the cluster CGr32. Left panel: 6′ × 6′ HST ACS (F814W filter, logarithmic scale, arbitrary units) map of COSMOS region, including the CGr32 cluster of galaxies. Spectroscopically identified cluster members within the MUSE data are indicated with blue circles, and galaxies in the Iovino et al. (2016) and Knobel et al. (2012) catalogues within the same redshift range (0.71685 ≤ z ≤ 0.74378) are indicated with red squares. Contours show the X-ray gas distribution (XMM-Newton, 0.5–2 keV, Finoguenov et al. 2007), smoothed with a two-pixel Gaussian. The grey dashed circle represents R200. Right panel: close-up of the region mapped with MUSE. Galaxies are colour coded according to their stellar mass (Epinat et al., in prep.), and those without mass estimates due to blending in broad-band images are shown with black circles. The black star indicates the barycentre of the MUSE cluster members, the black plus sign is the centre quoted by Iovino et al. (2016), and the black cross indicates the X-ray centre of Gozaliasl et al. (2019). The tails of ionised gas are indicated with a blue contour (Σ([OII]) = 1.5 × 10−18 erg s−1 cm−2 arcsec−2).

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