Mass distribution for the NGFS nuclei (top panel), the radial-velocity-confirmed CSSs in Fornax (middle panel), and the dwarf spheroids (bottom panel). The probability density distribution for each sample is overplotted using an Epanechnikov kernel density estimate together with the 1σ uncertainty ranges. The size of each sample is given in parentheses in the corresponding panel. The inset figures show the Aikake and Schwarz (Bayesian) information criteria (AIC and BIC; see Ivezić et al. 2014), which define the most likely number of Gaussian components for each distribution; here we use the AIC. The corresponding Gaussians are indicated by the dashed curves.