Colour−colour diagrams. Grey lines are number density contours for GOODS-South CANDELS objects, using Guo et al. (2013) photometry. Blue dots: A2744 cluster field, this work (only objects detected in all relevant bands are included). The large majority of the objects inside the red ellipses, which deviate from the typical distributions, are likely to be cluster members, as confirmed by the photo-z analysis in C16.
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