Ratio of vertical velocity dispersion of stars in bins in ⟨ R_i ⟩ and ⟨ R_f ⟩ − ⟨ R_i ⟩ to the vertical velocity dispersion of all stars in radial bin centred on ⟨ R_i ⟩. The shaded areas represent the bar ILR (blue), CR (red), and OLR (green) radii variation in the time-span of each plot. The red vertical lines are the average of the bar CR radius during the time-span of a plot.