Relations M_s/M_DM_D at different redshifts for theoretical models (all masses are in solar units). The dotted lines of different colours correspond to the eight values of the redshift z = 0 and z = 0.2 (top, red), z = 0.6, z = 1.0 (intermediate, yellow), z = 1.6 and z = 2.2 (intermediate, green), z = 3 and to z = 4 (bottom, blue). The black dots are the values predicted by Eq. (A.1) at varying log M_D from 4 to 14 in steps of 1 and redshift z from 0 to 4 in steps of 1, respectively. The large red and golden circles are the combination of Eqs. (A.3) and (A.2), respectively. The open magenta (z = 0) and black (z = 3.95) circles are relation M_s/M_D vs. M_D at different redshifts according to Girelli et al. (2020). We note how all relations agree with each other at log M_D ≃ 12 whereas they badly disagree at lower values of M_D.