Marginal (diagonal panels) and two-parameters joint (off-diagonal panels) distributions of all the free parameters in the MCMC run ($\gamma {\prime }_{\mathrm{IN}}$, $\gamma {\prime }_{\mathrm{OUT}}$, ν, T_equiv,★, R_★, M₂₀₀, lnc₂₀₀, u_peak, R_peak, log ξ, α_inf, α₀, R_CEN, $\gamma {\prime }_{\mathrm{CEN}}$, η, log ϵ_N, log ϵ_T and log ϵ_SZ; see Sect. 4.1, for details). In each diagonal panel, the black curve and the orange histogram are the marginal prior and posterior, respectively; the light-orange vertical band is the 16th-84th percentile interval of the marginal posterior. In each off-diagonal panel, the dark-orange and light-orange regions, enclosed by the blue lines, define the 68% and 90% credible regions of the joint posteriors, respectively.