Plot used to determine the mass for high mass stars. The different line colours signify the masses of the lines ranging from 1.3 M_⊙ (magenta/purple) to 1.6 M_⊙ (blue) in steps of 0.1 M_⊙. The various line types indicate the metallicity. The shaded area shows where the lines start to become hard to separate. The yellow star indicates the position of HAT-P-7 whilst the red star gives the location of Procyon in the plot.