First column: uncertainties in v_Φ (first row), v_R (second row) and v_z (third row) of stars as a function of their distance D from the Sun. Distances are given in kpc. Second column: uncertainties in v_Φ (first row), v_R (second row) and v_z (third row) of stars as a function of corresponding velocity (given in km s⁻¹). Third column: uncertainties in v_Φ (first row), v_R (second row) and v_z (third row) of stars as a function of [Fe/H]. Fourth column: Uncertainties in v_Φ (first row), v_R (second row) and v_z (third row) of stars as a function of [Mg/Fe]. In all panels: individual uncertainties are shown with grey points; their density distributions, in logarithmic scale, are indicated by coloured contours, whose corresponding values are reported in the error bars; the dotted, solid and dashed black lines show, respectively, the 25th, 50th (median) and 75th percentile of the distribution of uncertainties, as a function of the value reported on the x-axis. All velocity uncertainties are given in units of km s⁻¹.