... discs

Appendix A is only available in electronic form at http://www.edpsciences.org

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... sequence

Which is not to be confused with a formation sequence (see also Woitke 2000).

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... iron

See: http://www.astro.uni-jena.de/Laboratory/labindex.html

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... code

http://www.astro.uni-jena.de/Laboratory/labindex.html

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... constants

Note that the chemical equilibrium constants, K_p, used by different authors can cause differences in the resulting opacity values because it affects the number density of species. The same effect will be caused by the neglect of the metal ions in the chemical equilibrium calculations (see, e.g., Helling et al. 2000). It is, however, not very straightforward to decide which line list is the most correct (for a discussion see Jørgensen 2003). We nevertheless dare to demonstrate the difficulties arising from comparing Planck mean opacities calculated by different authors because it has - to our knowledge - not been pointed out clearly in the literature. Only comparisons of Rosseland mean opacities are presented, e.g. by Alexander & Ferguson (1994).

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