Structures in vertical velocity and angular momentum. Top: column normalised histogram of star numbers in the - plane for the AC20-ϖ∕σ_ϖ > 3 sample (the colour represents the fraction of stars in a given bin that have a certain ). Bottom: average Z of stars in each bin in - in our AC20-ϖ∕σ_ϖ > 3 sample. Contours are the same as the colour plot in the top panel. To guide the eye, we also show an approximate guiding radius .