Three-dimensional gI correlation function as a function of comoving line-of-sight separation Π and comoving transverse separation r_p at z ≈ 0.5. Contours are logarithmically spaced between 10^-2 (yellow) and 10^-6 (black) with three lines per decade. Top panel: applying a Gaussian photometric redshift scatter of width 0.02. Bottom panel: assuming exact redshifts. Note the largely different scaling of the ordinate axes. The galaxy bias has been set to unity, and (6) with SuperCOSMOS normalisation has been used to model P_δI in both cases. Redshift-space distortions have not been taken into account.