Recovery and contamination fractions – varying n. f_Rec (solid and dashed lines) and f_Con (dotted and dot-dashed lines) as a function of redshift. Bottom panel refers to low-density environments, while top panel refers to high-density environments. The various curves are colour-coded according to the various values of n (yellow: dv = 1000 km s^-1; red: n = 0.5; cyan: n = 1.5; and green: n = 3). The radius has been fixed to R_T = R_R = 1 Mpc and the uncertainty in the photometric redshift is σ_{Δz/ (1 + z)} = 0.01. There is a different scale on the ordinate axis between high-density and low-density environments.