\begin{table}%tD.1
\caption{\label{tab:opacities}Continuum opacity sources.}
\par
%\centering
\par
\begin{tabular}{ll}
\hline\hline \noalign{\smallskip}
Absorber and process				& Reference		                  \\
\hline
H$^-$ b-f							& \citet{Broadetal:1976,Wishart:1979}		\\
H$^-$ f-f							& \citet{Belletal:1987}		\\
\ion{H}{i} b-f, f-f						& \citet{Karzasetal:1961}		\\
\ion{H}{i}+\ion{H}{i}					& \citet{Doyle:1968}			\\
\ion{H}{i}+\ion{He}{i}					& \citet{Gustafssonetal:2001}	\\
H$_2$+\ion{H}{i}					& \citet{Gustafssonetal:2003}	\\
H$_2$+\ion{He}{i}					& \citet{Joergensenetal:2000}	\\
H$_2$+H$_2$						& \citet{Borysowetal:2001}		\\
H$_2^-$ f-f						& \citet{Bell:1980}				\\
H$_2$ photo-dissociation				& \citet{Allisonetal:1969}	\\
H$_2^+$ b-f, f-f						& \citet{Stancil:1994}				\\
He$^-$ f-f							& \citet{John:1995}                                 \\
\ion{He}{i} b-f						& TOPbase\tablefootmark{1}                         \\
\ion{He}{i} f-f						& \citet{Peach:1970}			\\
\ion{He}{ii} b-f						& TOPbase\tablefootmark{1}                         \\
C$^-$ f-f							& \citet{Belletal:1988}			\\
\ion{C}{i} b-f						& \citet{Naharetal:1991}             \\
\ion{C}{i} f-f						& \citet{Peach:1970}			\\
\ion{C}{ii} b-f						& \citet{Nahar:1995,Nahar:2002}            \\
\ion{C}{ii} f-f						& \citet{Peach:1970}			\\
\ion{C}{iii} b-f						& \citet{Naharetal:1997}             \\
N$^-$ f-f							& \citet{Ramsbottometal:1992}		\\
\ion{N}{i} b-f						& \citet{Naharetal:1997}                               \\
\ion{N}{ii} b-f						& \citet{Naharetal:1991}                                \\
\ion{N}{iii} b-f						& \citet{Naharetal:1997}                                \\
O$^-$ f-f							& \citet{John:1975}                                 \\
\ion{O}{i}, \ion{O}{ii} b-f				& \citet{Nahar:1998}                                \\
\ion{O}{iii} b-f						& \citet{Naharetal:1994b}                                \\
\ion{Ne}{i}, \ion{Ne}{ii}, \ion{Ne}{iii} b-f	& TOPbase\tablefootmark{1}                          \\
\ion{Na}{i}, \ion{Na}{ii}, \ion{Na}{iii} b-f	& TOPbase\tablefootmark{1}                          \\
\ion{Mg}{i}, \ion{Mg}{ii}, \ion{Mg}{iii} b-f	& TOPbase\tablefootmark{1}                          \\
\ion{Al}{i}, \ion{Al}{ii}, \ion{Al}{iii} b-f		& TOPbase\tablefootmark{1}                          \\
\ion{Si}{i} b-f						& \citet{Naharetal:1993}		\\
\ion{Si}{ii} b-f						& \citet{Nahar:1995}				 \\
\ion{Si}{iii} b-f						& TOPbase\tablefootmark{1}			 \\
\ion{S}{i} b-f						& TOPbase\tablefootmark{1}			 \\
\ion{S}{ii} b-f						& \citet{Nahar:1995}                                 \\
\ion{S}{iii} b-f						& \citet{Nahar:2000}                                 \\
\ion{Ar}{i}, \ion{Ar}{ii}, \ion{Ar}{iii} b-f		& TOPbase\tablefootmark{1}                           \\
\ion{Ca}{i}, \ion{Ca}{ii}, \ion{Ca}{iii} b-f	& TOPbase\tablefootmark{1}                           \\
\ion{Fe}{i} b-f						& \citet{Bautista:1997}                                  \\
\ion{Fe}{ii} b-f						& \citet{Naharetal:1994a}                                  \\
\ion{Fe}{iii} b-f						& \citet{Nahar:1996}                                  \\
\ion{Ni}{ii} b-f					         & \citet{Bautista:1999}                                  \\
CO$^-$ f-f							& \citet{John:1975}				\\
H$_2$O$^-$ f-f						& \citet{John:1975}				\\
OH b-f							& \citet{Kuruczetal:1987}				\\
CH b-f							& \citet{Kuruczetal:1987}				\\
\hline
\ion{H}{i} scattering					& \citet{Gavrila:1967}                   \\
H$_2$ scattering					& \citet{Victoretal:1969}               \\
e$^-$ scattering					& Thomson			           \\
\ion{He}{i} scattering					& \citet{Langhoffetal:1974}           \\
\hline
\end{tabular}
\tablefoot {\tablefoottext{1}{Contains Opacity Project data \citep{Seatonetal:1994}.}}
\vspace*{5.5mm}
\end{table}