Illustration of the mixing caused by the bar. Left: normalised stellar density distribution in guiding (R_g) – instantaneous (R) plane. Right: normalised stellar density distribution in guiding (R_g) – mean guiding (⟨R_g⟩, orbit averaged) plane. In the right panel, the effect of the main bar resonances CR, OLR, and 4:3 is seen as diagonal overdensities. We stress that these features are not the effect of radial migration (churning), as we consider a constant bar pattern speed and ignore the presence of spiral arms in the orbit superposition modelling. The colored lines indicate different quantiles of the distributions as functions of R (left) and R_g (right), as specified in the legend.