Spectral energy distribution (continuum) of chemically homogeneously evolving stars in different evolutionary stages as marked in the colored boxes in each panel. Left panels: provide the continuum SED of the models calculated with a smooth (D = 1) wind, while the right panels depict the same for the clumped (D = 10) wind assumption. The colored lines correspond to the models with specific M_ini (denoted in the top panels) and calculated assuming the same (nominal) mass-loss rate as given in Table 1. For each colored line, a black line also represents the SED of the model for the same star in the same evolutionary stages with the same clumping factor D, but assuming a mass-loss rate 100 times lower. For better visibility of the differences between the SEDs in the CHeB phase, see Fig. B1.