Assessment of cluster membership for the 17 white dwarfs. Red boxes indicate cluster distances of Dias et al. (2002), blue boxes those of Kharchenko et al. (2013), and points with error bars the white dwarf distances. The box sizes correspond to an uncertainty of 11 per cent of the cluster distance (Kharchenko et al. 2013). The candidate cluster members are represented by white circles with error bars, and the corresponding rows are highlighted by a grey shaded area.