Table 1: Sources of data for continuous opacities.
Ion and process Reference
I b-f1, f-f1 Karzas & Latter (1961)$^\ddagger$
H- b-f Wishart (1979)
H- f-f Bell & Berrington (1987)
He  I b-f TOPbase2
He  I f-f Peach (1970)
He- f-f John (1994)
I, C  II b-f TOPbase$^\dagger$
I, C  II f-f Peach (1970)
C- f-f Bell et al. (1988)
I, N  II b-f TOPbase
N- f-f Ramsbottom et al. (1992)
I, O  II b-f TOPbase
O- f-f John (1975a,b)
Mg  I, Mg  II b-f TOPbase$^\dagger$
Mg  I f-f Peach (1970)
Al  I, Al  II b-f TOPbase$^\dagger$
Si  I, Si  II b-f TOPbase$^\dagger$
Si  I f-f Peach (1970)
Ca  I, Ca  II b-f TOPbase
Fe  I b-f TOPbase, Bautista (1997)
Fe  II b-f TOPbase
other metals f-f Peach (1970), hydr. approx.
H2+ f-f Mihalas (1964)
H2- f-f John (1975a,b), John & Williams (1975)
CH b-f Kurucz et al. (1987)
OH b-f Kurucz et al. (1987)
CO- f-f John (1975a,b)
H2O- f-f John (1975a,b)
I+H  I CIA3 Doyle (1968)
I+He  I CIA Gustafsson & Frommhold (2001)
H2+H  I CIA Gustafsson & Frommhold (2003)
H2+H2 CIA Borysow et al. (2001)
H2+He  I CIA Jørgensen et al. (2000)
I scattering Dalgarno, quoted by Gingerich (1964)
H2 scattering Dalgarno & Williams (1962)
e- scattering Mihalas (1978)
He  I scattering Bues & Wehrse (1976)
1 ``b-f'' and ``f-f'' denote bound-free and free-free processes, respectively.
2 ``TOPbase'': data from the Opacity Project (Seaton et al. 1994),
available via http://vizier.u-strasbg.fr/topbase/home.html.
3 ``CIA'': collision induced or quasi-molecular absorption.
$^\ddagger$ Modified using the occupation probability formalism, see text.
$^\dagger$ The calculated wavelengths of UV and blue C  I, Mg  I, Al  I and Si  I absorption
edges have been shifted to their. laboratory values, see text.


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