Distribution of M₂₀₀ and c₂₀₀ parameters for the NFW halos in LENSTRONOMY composite model (blue shaded region). This distribution is averaged over all the model settings within the composite model family following the procedure described in Sect. 6.3. The 2 contours correspond to the 68% and 95% credible regions, respectively. The black solid line traces the theoretical prediction of the M₂₀₀ − c₂₀₀ relation at z_d = 0.230 from Diemer & Joyce (2019) with the grey shaded region corresponding to the 68% confidence interval. We adopt this M₂₀₀ − c relation as a prior in our analysis in addition to a M₂₀₀ prior based on Sonnenfeld et al. (2018).