Fig. 2
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Examples of cluster morphology in Galactocentric Cartesian coordinates. The upper panel shows Melotte 111 (a high-ϕ cluster), while the lower panel illustrates NGC 3532 (a low-ϕ example). The red lines denote the projection of the first principal PCA axis in 3D, and the gray dashed lines represent the solar position to the cluster center (marked by the black cross).
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