Fig. 7.
Selected colour-colour and magnitude-colour diagrams of VEXAS high-confidence (pclass = 0.7) STAR (red contours), QSO (green contours), and GALAXY (blue contours), over the three optical footprints (VEXAS-DESW, left column, VEXAS-PSW, middle column, and VEXAS-SMW right column), split according to the predicted class. Bottom right panel: issue with the imputation for VEXAS-SMW, which is described in detail in Sect. 6 and in Appendix C.3.
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