Fig. 2
Colour composite image of RXC J2248 overlaid with the Chandra X-ray contours in white (Gómez et al. 2012). Red circles indicate the selected cluster members (see Sect. 3.1.2). The magenta circle shows the second brightest cluster member, used as the reference for the normalization of the mass-to-light ratio of the cluster members, i.e. L0 in Eq. (3).
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