Measured cross-correlation function between the kSZ temperature estimates and the recovered radial peculiar velocities, , according to the LINEAR approach. The recovered velocities are divided with their rms dispersion σ_v = 310 km s^-1, so kSZ temperature estimates are correlated to a quantity of variance unity. This plot corresponds to an aperture of 8 arcmin. Filled coloured circles correspond to estimates from different CMB maps (SEVEM, SMICA, NILC, COMMANDER, and the HFI 217 GHz map). The dotted lines display the null estimates obtained after computing kSZ temperature estimates for rotated positions on the SEVEM map, and the thick dashed line displays the average of the dotted lines. Error bars are computed from these null estimates of the correlation function. The solid line provides the best fit of the SEVEM data to the theoretical prediction for obtained from the GALAXY mock catalogue. These predictions are obtained using only a relatively small number of mock halos, and hence their uncertainty must be considered when comparing to the data.