...1995a)

The latest compilation of wind envelope models for carbon-rich compositions indicate a similar dependence of the mass-loss rate on the actual stellar mass: $\dot{M} \propto M^{-1.95}$ (Wachter et al. 2002).

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... "shell''

Mellema (1995) used the terms "I-shell'' and "W-shell'' instead of "shell'' and "rim'', as to indicate that the "shell'' is the result of ionization and the "rim'' the result of wind interaction.

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... PN

At the very beginning of the double-shell phase the shell ratio may increase for a short period.

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