Total rotational amplitudes divided by the velocity dispersion for the P1 (blue) and P2 (red) stars for each of the dynamically young clusters in our sample, as well as for all stars (green) as described in Section 3.1 and listed in Table A.1. Solid circles indicate that both populations contain enough stars with LOS velocities for a statistically robust result (N_LOS,P1 + N_LOS,P2 > 300), while open circles indicate the opposite. Cluster names are colour-coded based on whether the cluster has a significant P1 (blue) central concentration, P2 (red) central concentration or are spatially mixed (black). Clusters are ordered based on the A_total/σ values derived using all available stars as listed in Table A.1, such that clusters on the left (right) have lower (higher) rotation.