Relations between different points of the clusters’ luminosity profile vs. the maximum magnitude range . Panel a) shows the relation between the boundary values of the observed profile of integrated magnitudes I^br(M_KS) − I^fn(M_KS), panel b) the fainter part of the profile I¹²(M_KS) − I^fn(M_KS), and panel c) its brighter part I^br(M_KS) − I¹²(M_KS). Blue crosses indicate clusters with , and red circles clusters with .