Aitoff projection of the values of the VSF amplitude v₀ and the power-law index m, measured for 2000 randomly selected orientations at fixed time t = 3.2 Gyr within r = 25 kpc. Each VSF was computed from projected Hα emission weighted maps. The power-law fitting was performed between 2 and 4 kpc. As we do not include effects of opacity when generating the projection of the velocity maps used to obtain each VSF, the left and right half of the plot are symmetrical for both v₀ and m. The coordinates of the jet injection axis is at θ = ±90°.