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| Absorber and process | Reference |
| H- b-f | Wishart (1979); Broad & Reinhardt (1976) |
| H- f-f | Bell & Berrington (1987) |
| H I b-f, f-f | Karzas & Latter (1961) |
| H I+H I | Doyle (1968) |
| H I+He I | Gustafsson & Frommhold (2001) |
| H2+H I | Gustafsson & Frommhold (2003) |
| H2+He I | Jørgensen et al. (2000) |
| H2+H2 | Borysow et al. (2001) |
| H2- f-f | Bell (1980) |
| H2 photo-dissociation | Allison & Dalgarno (1969) |
| H2+ b-f, f-f | Stancil (1994) |
| He- f-f | John (1995) |
| He I b-f | TOPbase1 |
| He I f-f | Peach (1970) |
| He II b-f | TOPbase1 |
| C- f-f | Bell et al. (1988) |
| C I b-f | Nahar & Pradhan (1991) |
| C I f-f | Peach (1970) |
| C II b-f | Nahar (2002,1995) |
| C II f-f | Peach (1970) |
| C III b-f | Nahar & Pradhan (1997) |
| N- f-f | Ramsbottom et al. (1992) |
| N I b-f | Nahar & Pradhan (1997) |
| N II b-f | Nahar & Pradhan (1991) |
| N III b-f | Nahar & Pradhan (1997) |
| O- f-f | John (1975) |
| O I, O II b-f | Nahar (1998) |
| O III b-f | Nahar & Pradhan (1994b) |
| Ne I, Ne II, Ne III b-f | TOPbase1 |
| Na I, Na II, Na III b-f | TOPbase1 |
| Mg I, Mg II, Mg III b-f | TOPbase1 |
| Al I, Al II, Al III b-f | TOPbase1 |
| Si I b-f | Nahar & Pradhan (1993) |
| Si II b-f | Nahar (1995) |
| Si III b-f | TOPbase1 |
| S I b-f | TOPbase1 |
| S II b-f | Nahar (1995) |
| S III b-f | Nahar (2000) |
| Ar I, Ar II, Ar III b-f | TOPbase1 |
| Ca I, Ca II, Ca III b-f | TOPbase1 |
| Fe I b-f | Bautista (1997) |
| Fe II b-f | Nahar & Pradhan (1994a) |
| Fe III b-f | Nahar (1996) |
| Ni II b-f | Bautista (1999) |
| CO- f-f | John (1975) |
| H2O- f-f | John (1975) |
| OH b-f | Kurucz et al. (1987) |
| CH b-f | Kurucz et al. (1987) |
| H I scattering | Gavrila (1967) |
| H2 scattering | Victor & Dalgarno (1969) |
| e- scattering | Thomson |
| He I scattering | Langhoff et al. (1974) |
Notes. (1) Contains Opacity Project data (Seaton et al. 1994).
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