Line-of-sight velocity dispersion profile (circularized) corresponding to the lens model posteriors in the power-law (red) and composite (blue) models from LENSTRONOMY. Isotropic stellar orbits are assumed in computing these velocity dispersion profiles. The solid lines correspond to the median and the shaded regions encompass the 16th and 84th percentiles. The composite profile predicts a decrease in the velocity dispersion towards the centre due to the flattened core – which is not observed in local massive ellipticals (e.g. Cappellari 2016; Ene et al. 2019) – thus pointing to the atypicality of the posterior mass profile in the composite model.