Corner plot of the posterior for the PBH models (Sec. 2). The parameters describing the mass function of the PBHs (eq. 2) are obtained via the MCMC using constraints at z = 11 and assuming PBHs are distributed independently of halo mass. Each color corresponds to a value for λ_E, as reported in the legend. An interesting feature to note is that, as long as λ_E > 0.01, changing λ_E shifts the posterior distribution, as indicated in eq. 10. Tabulated results are reported in Tab. 1.