Superposition of orbits (galactocentric distance R as a function of time) of stars that migrate from the inner region ( kpc) and have a low orbital eccentricity (ε <  0.15) at t = 7 Gyr. The number of stars in a given time-radius bin is indicated by color (see scale at top). The intensity of migration is strongly connected to the slowdown of the bar and to the following propagation of its resonances outward. Most of the migrating stars are locked between two resonances: CR (solid line) and OLR (dashed line).