Mass corresponding to the turnaround mass M_T(R) (red line), future collapse mass M_FC(R) (violet line), zero-gravity mass M_ZG(R) (blue line), and linear mass M_L(R) (grey line; in units of 10¹⁵h^-1M_⊙) versus radius of a sphere R in different dynamical evolution models for Ω_m = 0.27. Filled circles show the total masses of galaxy groups in regions of different global density in the A2142 supercluster (Table 2). Stars denote estimated masses as explained in the text. Numbers show global density lower limit for a region (env marks Main+env region, 2 and 3 denote regions of galaxy groups in the tail of the supercluster).