Fig. 22.
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Velocity maps for the RGB sample. Left panel: inferred radial velocity, VR. Right panel: map for 
, i.e. the residual azimuthal velocity. Overlaid on both maps is the two-arm NIR spiral model from Drimmel (2000), shown as solid lines. The dashed lines correspond to the minimum inter-arm density (see text). The position of the Sun is marked by a black dot.
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