Fig. 13.
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Contamination with extragalactic sources is negligible in the UCD parameter space of the bluebottle diagram. Both plots show a distribution of the entire (unfiltered) Q1 catalogue. Left: Red contours mark the shape of the bluebottle diagram. Right: Objects in common between Euclid and Simbad: black dots are QSOs, AGNs, supernovae, or galaxies; and yellow dots are stars. Brown dwarfs (red dots) are from Zhang et al. (2024).
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