Evaluation of the remaining uncertain cluster memberships, after applying the main selection criteria. The top row of panels shows how the g′−r′ color, concentration (C), and RFF are related for the galaxies that we selected using the preliminary selection cuts (see Sect. 8.2) and visual classification (see Sect. 8.3). The different colors correspond to visual morphological classifications of these galaxies, and the colors are explained in the legend of the upper left panel. Mid row: same parameters as the top row but limiting to galaxies with m_r′ >  15 mag. This is the range of the galaxies that we could not classify morphologically with certainty. In the bottom row we show the parameters for these uncertain cases with the green points. The limits that we used for classifying the uncertain cases into early- and late-type cluster, and background galaxies are shown with black lines. Altogether nine of galaxies with uncertain classifications were classified as background, four as cluster late-types, and nine as cluster early-type dwarfs.