Hertzsprung-Russel diagram for β = 2, F_cl = 0.05, and solar composition without rotational enhancement. The black and gray symbols mark the evolutionary tracks and isochrones, respectively, calclulated by Ekström et al. (2012). We use the stellar parameters from these models, together with our choice of wind parameters, to create the CMFGEN atmospheric models in our grid. The yellow and cyan stars indicate evolutionary track and isochrone models, respectively, for which we have already generated an atmospheric model. The large blue star shows the location of our best-fit model to the observation of ϵ Ori. The numbers left of the evolutionary tracks are the initial masses of the tracks (in M_⊙). They also mark the approximate location of the ZAMS. The red symbols below selected isochrones indicate their ages (in 10⁶ years). At the top of the figure we indicate the approximate locations of selected spectral classes.