Left: absolute magnitude and Right: effective radius in logarithmic scale as a function of redshift. Cyan triangles are BCGs fit by two Sérsic components (the outer component is considered), while the magenta points are BCGs fit with only one Sérsic component. Blue squares represent the BCGs observed in too blue filters, red squares are SF BCGs (see Sect. 3), black triangles are pairs of BCGs, and the light pink squares are BCGs with an important inner component contribution.