Two-dimensional CFs and related functions for models for different thickness of 2D samples. Top row: LCDM model with particle density limit ρ₀ = 10. Second row: Millennium samples with magnitude limit M_r = −20.5 in real space. Bottom row: Millennium samples with magnitude limit M_r = −20.5 in redshift space. Left panels: CFs. Central panels: gradient functions. Right panels: relative bias functions. As argument we use pair separations perpendicular to the line of sight, . As parameter we use the thickness of samples, L. Lines of various colours mark 2D samples of different thickness. For comparison we show 3D functions for samples with ρ₀ = 10 and M_r = −20.5. Error bars are shown for some samples.