Corner plots for different mass models of zC-400569 (see Sect. 5): baryons only (top left), MOND (top right), and baryons plus a NFW halo (bottom). The various panels show the posterior probability distribution of pairs of fitting parameters, and the marginalized probability distribution of each fitting parameter. In the inner panels, individual MCMC samples outside the 2σ confidence region are shown with black dots, while binned MCMC samples inside the 2σ confidence region are shown by a grayscale; black contours correspond to the 1σ and 2σ confidence regions; the red squares and solid lines show median values. In the outer panels (histograms), solid and dashed lines correspond to the median and ±1σ values, respectively.