Running means of the color-magnitude relations in different colors for the dEs. The red, green, and blue lines corresponds to inner, middle and outer bins in the Fornax cluster, respectively. The black lines show the Roediger et al. (2017) color-magnitude relation in the core of the Virgo cluster. We use the g′-band absolute magnitudes on the x-axis instead of r′-band, since the analysis for the Virgo was done using g′-band.