Varying σ_{Δz/ (1 + z)} – effect of R_R/R_T, contamination. f_Con (normalized to the value of f_Con at R_R/R_T = 1 separately for each value of σ_{Δz/ (1 + z)}) as a function of R_R/R_T in the redshift bin 1.50 <z< 1.75. 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 σ_{Δz/ (1 + z)} (purple: σ_{Δz/ (1 + z)} = 0.003; blue: σ_{Δz/ (1 + z)} = 0.01; green: σ_{Δz/ (1 + z)} = 0.03; and red: σ_{Δz/ (1 + z)} = 0.06). Shaded regions show the dispersion in the fraction values at fixed R_R/R_T given by different R_T because smaller R_T are reconstructed better than larger R_T. The length of the volume has been kept fixed, with n = 1.5.