Weighted average Kriging estimations for Z (pc) and V _Z (km s⁻¹) as a function of the Galactocentric radius (R; bins of 20 pc) and the Galactocentric azimuthal angle (Φ; bins of 0.°5), respectively. ﹩{\sigma }_{i}^{-1}﹩ is taken as the weight. The shaded areas correspond to the standard deviations of the weighted averages, assuming correlated measurements. The vertical dashed line accounts for the Sun’s location.