Comparison between the Γ − N_BMC correlations for Mrk 766 and for 4U 1630-Rb. The black arrow shows that the two sources seem to behave the same way, the only difference being the gap in the BMC normalization due to the different value of the M_BH/d² ratio. In the small box the re-binned points (green) and the average points computed from the 2000, 2001, and 2005 observations (blue) are plotted.