The existence of color gradient across the face of many galaxies is seen in our data. Colors are generally redder toward the nucleus. The gradients show a strong wavelenght dependence, similar to the C-M effect itself. The mean gradients are the same for E and S0 galaxies separately and show no depedence on absolute magnitude in the range -20 < Mv < -24.
Differentiation of the color-aperture effect gives an average variation of delta (u - V)=0.15 mag in the surface color over the interval 0.1 < theta/D(0) < 1.0. This variation can be explained by an outward decrease in mean metal abundance in the disks and halos by a factor of ~2 over the stated diameter interval.
The mean Galactic reddening obtained from the data smaller by a factor of 2 in b-V, V-r, and u-V than values based on galaxy counts, but is consistent with other recent determination from colors of high-latitude stars and globular clusters.
The C-M effects is shown to be the same for field E and S0 galaxies as cluster and group members. Hence the effect may be universal and, further, present data provide no evidence for differences in the stellar content of early-type galaxies that depend on their environment.