Gaia EDR3 colour-magnitude diagram for the hot subluminous star region showing the initial parallax selection (grey dots), final Parallax Selection (yellow circles), known hot subdwarfs with no binarity observed (cyan squares), known hot subdwarfs in wide binary systems (magenta triangles), and known hot subdwarfs in close binary systems with WD, dwarf-M type or brown dwarf companions (blue diamonds).The red line shows the cutoff used to remove the main sequence region.