Color–magnitude diagram of Field M (grey), L (green), T (blue) objects, the sample targets (filled red) and other young companions (unfilled red), and the HR 8799 planets with measured J and K magnitudes (black). The field data were taken from the DwarfArchive.org and restricted to objects with parallax uncertainty  <10% and color uncertainty  <0.5 mag. The values used for the targets are given in Tables 1 and 2. For the young companions CHXR 73B (Luhman et al. 2006), 1RXS J1609B (Lafrenière et al. 2008), GSC 06214 B (Ireland et al. 2011) and HD 203030B (Metchev & Hillenbrand 2006) that are plotted on the figure, but not included in this study, the data were taken from the discovery papers.