Evolution of the rotation velocity of the kinematic substructures as a function of the radius. From all the peaks at the 51 volumes along the Sun-GC line, only significant peaks according to Poisson (CL ≥ 2) with radial velocities in the range [+60,−60] km s−1 were considered. The peaks detected at Solar radius (8.34 kpc) are shown as squares; the remaining peaks are shown as circles, linked together through solid black lines when observed to belong to the same structure (except for L13, see text). The dashed grey lines correspond to constant angular momentum tracks.
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