Example of MCMC posteriors of mass-modeled synthetic coadded RCs, in the case of the Burkert and the NFW halo, on the left and right, respectively. Here, we show that the posteriors correspond to the synthetic coadded RC shown in Figure B.1. The best-fit parameters are printed above each posterior with a 1σ uncertainty. The vertical black dashed lines show the best-fit central value along with the 1σ upper and lower limit, and the true values are shown by blue crosses.