Measured cross-correlation function between the kSZ temperature estimates and the recovered radial peculiar velocities, , according to the three adopted approaches, LINEAR (left panel), LOG-LINEAR (middle panel), and LOG-2LPT (right panel). The velocities are normalized with their rms dispersion σ_v = 230, 310, and 200 km s^-1from left to right, respectively. We use an aperture of 8 arcmin when estimating kSZ temperature fluctuations. 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 to the data of 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 data.