Left panel: Difference of the median azimuthal velocity compared to its average value at fixed R in the Gaia RVS data, $\mathrm{\Delta }{\tilde{V}}_{\phi }\equiv {\tilde{V}}_{\phi }(x,y)-{\tilde{V}}_{\phi }(R)$, in the (x, y) plane defined on [4,12] kpc × [−4,4] kpc, binned with (125 pc)² bins. Right panel: Difference between the median azimuthal velocity of the fiducial model and that of the background axisymmetric DF. In both panels, the black cross indicates the Sun’s position.