Comparison of the position angle of the rotation axis from Leitinger et al. (2025) and the position angle measured in this work. The black line indicates the identity. In this case, this represents an alignment between the semi-minor axis of the ellipse and the rotation axis of the cluster. Here, we have only included the clusters classified as flattened and with an available position angle for the rotation axis. Some clusters are classified as non-rotating in Leitinger et al. (2025), but they still have a measured rotation strength and position angle for the rotation axis. They are plotted with a star symbol.