Upper panel: color map of the temperature distribution in the inner part (up to 20 R_eq) of the circumstellar outflowing disk of a critically rotating star with the same stellar parameters as in Fig. 9, with the disk mass-loss rate Ṁ = 10⁻¹⁰ M_⊙ yr⁻¹, with the constant viscosity parameter α = α₀ = 0.1. The strip of increased temperature generated by the viscous heating begins to be visible near the disk midplane. The contours mark the temperature levels 2000 K, 3000 K, 5000 K, 10 000 K (and 12 000 K at the base of the disk). Lower panel: color map of the temperature distribution in the very inner part (up to 5 stellar equatorial radii) of the circumstellar outflowing disk of a critically rotating star with the same stellar parameters as in Fig. 9, corresponding however to a disk mass-loss rate Ṁ = 10⁻¹¹ M_⊙ yr⁻¹, with a constant viscosity parameter α = α₀ = 0.1. The strip of increased temperature near the disk midplane generated by the viscous heating for this Ṁ disappears. The contours mark the temperature levels 5000 K, 8000 K, 10 000 K, 11 000 K, and 12 000 K.