Time-averaged emission measure distribution of the post-shock plasma for accretion streams with the same metal abundance (ζ = 1.0) and density (n_acc = 10¹² cm^-3) but different velocities (upper panel), for streams with the same metal abundance (ζ = 1.0) and velocity (u_acc = 400 km s^-1) but different densities (middle panel), and for streams with the same density (n_acc = 10¹² cm^-3) and velocity (u_acc = 400 km s^-1) but different metal abundances (lower panel).