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Fig. 2.


Orbital energy (top), radial action (centre), and vertical action (bottom) as a function of the vertical angular momentum component for the globular clusters (red circles) and CN-strong stars (squares). Stars with circularity >0.7 are shown in light blue and stars with circularity ≤0.7 are in dark blue. Clusters in pink are those with too high or too low orbital energy. The green star indicates the position of the Sun. The black dashed lines trace circular orbits.

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