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Fig. 11.


Colour-colour plots of point-like XPS sources showing our separation between stars and no-stars using the hdbscan clustering algorithm (see Sect. 5.2). Left panel: g−z versus zW1. Right panel: g−z versus JK. Green triangles are sources classified as stars; blue circles are sources classified as no stars; grey asterisks show unclassified objects. Darker shades mean a higher density of sources.

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