(a) Colour map of Γ_OPAL for the stellar parameters from Table 1. Temperature is given on the abscissa and radiation-to-gas pressure ratio on the ordinate. is identified with a white contour. The colour bar on the right corresponds to the colour coding of the plot and gives the numerical value of Γ_OPAL for a given temperature and radiation-to-gas pressure ratio. Different line styles show the radiation-to-gas pressure ratio and temperature structure for the different fixed mass-loss rates. (b) Ratio of kinetic to core potential energy of the corresponding solutions from panel a. The abscissa here shows the radius coordinate x.