CMD for the simulated Pleiades like cluster at distances of 1300 pc (top), 2600 pc (middle) and 3900 pc (bottom). The three clusters have 216, 143 and 114 observed members respectively. Open circles show the “true” simulated absolute magnitudes without errors, and filled circles show the absolute magnitudes calculated directly from the simulated observations including simulated gaia errors. Stars with negative parallaxes are omitted from the figure but included in the ML estimation. Reddening in V − I is assumed known. The blue crosses are the points fitted with the ML method and the solid line is the resulting isochrone-like sequence.