Spatial auto- and cross-correlation functions, ξ_A and ξ_C, respectively, for the WMAP7 ILC map for matched-circle radius α = 23°, shown as thin and thick (colour online) curves, respectively. The cross-correlation function is uniformly sampled only for β ≤ 0.44 (for calculation speed); at higher separations, it is, in principle, biased. In order to better compare the small-scale behaviour of ξ_A and ξ_C, the auto-correlation reduced (arbitrarily) by a factor of 4 is also shown. The mostly upper (lower) member of each close pair of functions is for the KQ85 (KQ75) galactic mask.