Geometric (r_geo) and photogeometric (r_pgeo) distances estimated by Bailer-Jones et al. (2021) for the targets in NGC 6231, where the black dashed lines are the median geometric and photogeometric distances to the targets, and the blue dashed lines indicate the distance to the cluster found by Kuhn et al. (2019) within 3σ. Black points are stars found to be single, and green points are stars that are found to have binary solutions in this work. Open-faced points are stars that have an r_pgeo that does not fall within 3σ of the quoted distance to NGC 6231.