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Table C.1

Elements according to maximal contribution to Rayleigh scattering if all hydrogen is in atomic form (or molecular form, given in parentheses).

Element Z2 × nZ/nH

HI (H2) 1 (2)
He 0.340
O 0.031
Fe 0.021
C 0.010
Ne 0.008
Si 0.006
Mg 0.006
Total 1.42 (2.42)
Other elements (total) 0.01

Notes. nH is the total number density of hydrogen atoms in HI or H2 form. Solar photospheric abundances from Asplund et al. (2009) are assumed.

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