Left: modeled velocity field of M 99 from the 2D asymmetric case for the shifted Einasto halo with v_R motions. Contours are the same as in Fig. 11. Middle: corresponding residual velocity field. Right: comparison of major axis l.o.s. velocities of the observation with the centered-halo and shifted-halo cases. Blue and red symbols indicate the approaching and receding sides, respectively. Open dotted and crossed symbols indicate the observed velocity field, filled diamonds, and triangles for the asymmetric centered- and shifted-Einasto models, respectively, with the contribution from v_R.