Colour-absolute magnitude diagram for the 54 Hipparcos Pleiades members. M_H is the absolute magnitude in the Hipparcos photometric band calculated using the posterior parallax. The blue crosses are the results of the fitting, with the spline function giving the magnitude dependence as the thick line. The green dashed line is the theoretical isochrone generated using PARSEC v1.1, with an age of 100 Myr, and Z = 0.03 (Bressan et al. 2012).