Plot for determining the stellar mass. The colours give the masses of the lines ranging from 1.3 M_⊙ (magenta/purple) in steps of 0.1 M_⊙ to 1.6 M_⊙ (blue). The different line types are explained in the legend. The shaded area in the figure indicates where the lines are hard to disentangle. In the middle of the plot, where the tracks mix (ordinate values of ~60 μHz), is where a star will go through the MS turn-off.