Fig. 5.

Colour-magnitude diagrams for the sample of LSB candidates in the clusters after correcting for fore- and background interlopers and incompleteness. The colour bar gives the residual weight of the data points (as detailed in Sect. 3.4). Left panel: cluster SPTCL-2106, right panel: cluster MOO-1014. Additionally shown in the left panel, we have the positions in the colour-magnitude diagram of spectroscopically confirmed members of SPTCL-2106 and an extrapolation of the red sequence as defined by the confirmed members of SPTCL-2106, ignoring some of the data points that may be part of a bluer or star-forming cluster population to guide the reader’s eye. This line has a slope of −0.12.
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