Fig. 4
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Gaia EDR3 Colour magnitude diagram (CMD). Upper panel: full-scale Gaia EDR3 CMD (grey dots) with the Gaia EDR3 initial hot subluminous star CMD range (red rectangle) used in subsequent CMD plots; lower panel Gaia EDR3 initial hot subluminous star CMD region. The colour scale shows the number density of objects. The cyan line shows the cutoff used to remove the main sequence region.
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