Chromosome map of NGC 2419 RGB stars. Panel a: different populations as selected through the GMM algorithm are highlighted with different colours. A larger marker size indicates an higher probability that a given star belongs to the assigned population. The confidence ellipsoids of each subpopulation fitted with the GMM algorithm are also plotted. Panel b: Histograms of the distribution along Δ_{F336W, F343N, F438W} of the total population and of each subpopulation. Panel c: same as in panel b, but for the distribution along Δ_{F438W, F814W}.