Fig. C.1.
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Gaia astrometric parameters of OB stars within a radius of 30′ around the centre of the IC 1805 open cluster. The blue symbols stand for BD+60° 497. Black open circles indicate O-type star, whilst the green triangles stand for B0-B3 stars. The red circle stands for the O9.5 star KM Cas whose membership in the cluster was questioned.
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