Radial velocity dispersion profiles as a function of radius for models with an IMBH mass of 2% of the stellar mass with the same initial concentration factor. Red points are the observed data taken from different sources (Sect. 2.3). Black, magenta, light blue and green are models with initial half-light radius (r_hp) of 11.6, 12.2, 12.8 and 13.4 pc, respectively. A typical uncertainty for models at 5′′ is indicated in blue. Higher initial r_hp models end up with a higher velocity dispersion across all radii but with roughly the same overall shape because of their higher total cluster mass as described in Sect. 4.