Colour-magnitude diagram of the cluster members selected in our membership analysis. The stars are colour-coded based on their membership probability that is scaled from zero to one. The black solid line shows the empirical isochrone of the cluster (see Table A.3). The arrow indicates the extinction vector of A_V = 1 mag converted to the Gaia bands using the relative extinction values given by Wang & Chen (2019). The three sources marked with green triangles denote the components of binary systems that we added manually to the sample, as explained in the text of Sect. 2.