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Fig. B.1.

image

Two-dimensional projection of the VEXAS-PSW sources with a spectroscopic match created with UMAP. Each point represents a source within the two-dimensional reduced space, and it is colour coded according to its spectroscopic classification. Bottom lower panel: each line of three-plots is relative to a different spectroscopic survey, as indicated by the titles. Each panel within a line highlights a different class of objects. Grey points represent the sources belonging to the other two classes instead.

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