$\sigma/V_{\rm C}$ intervals with a clear predominance of one type above the others, and colour-code the data accordingly, keeping in mind that the overlap between classes is going to be a source of scatter (particularly between *orange* and *red* data points).

In addition, we colour in *green* the outliers, i.e. galaxies that do not fall in the locus of the model (those with $\sigma/V_{\rm C} > 0.8$ and $\sigma/V_{\rm C} < 0.35$). We also consider as outliers all objects with $V_{\rm C}<100 \ km/s$, which fall way off both the bulk of the data and the model in the TF plot (Fig. (\[tfmodel\]); moreover, the model starts to suffer from resolution effects at those masses, given the mass resolution of the Millennium simulation).

The outliers are mostly dispersion-dominated (in accord with the analysis by Catinella et al. 2012), a feature that in the model is a signature of an early-type/elliptical galaxy. A few outliers show instead a very low velocity dispersion. However, in the range of circular velocities considered here, ratios $\sigma/V_{\rm C}<0.35$ yield velocity dispersions $\sigma < 70 \ km/s$, which is the resolution limit of the Sloan spectrograph. For this reason, such values of the velocity dispersion cannot 