Correlation of GC population size N _GC vs. the dynamical mass . E galaxies are plotted as open circles, S0s as solid red circles, and spirals as blue crosses. The N-values for the S0 and spiral types have been normalized to the E-galaxy level as described in the text. The solid diagonal line shows the best-fit solution for all galaxies with M _dyn > 10 ¹⁰  M _☉.