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\begin{document}
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\begin{planotable}{lll l}
\tablenum{A8}
\tablewidth{4.0in}
\tablecaption{EXTINCTION LAW}
\tablehead{
%------------------- 1st row ----------------------
\colhead{$\log\nu$} &
\colhead{${A_{\lambda}/ A_{V}}$} &
\colhead{$\log\nu$} &
\colhead{${A_{\lambda}/ A_{V}}$ } \\
\multicolumn{2}{c}{(RL85)} &
\multicolumn{2}{c}{(SM79)} \\
}
\startdata
13.36&0.029&13.95&0.05\\
13.38&0.032&14.13&0.12\\
13.40&0.039&14.38&0.28\\
13.42&0.048&14.52&0.48\\
13.44&0.061&14.63&0.75\\
13.46&0.074&14.74&1.00\\
13.48&0.077&14.83&1.32\\
13.50&0.087&14.875&1.42\\
13.52&0.074&14.940&1.58\\
13.55&0.045&15.039&2.00\\
13.57&0.023&15.079&2.35\\
13.48&0.055&15.097&2.58\\
13.78&0.026&15.115&2.86\\
13.93&0.061&15.136&3.12\\
&&15.155&3.01\\
&&15.176&2.78\\
&&15.198&2.58\\
&&15.220&2.50\\
&&15.246&2.54\\
&&15.273&2.62\\
&&15.304&2.63\\
&&15.334&2.74\\
&&15.380&3.11\\
&&15.405&3.40\\
&&15.432&3.73\\
&&15.456&4.16\\
&&15.477&4.65\\
\tablecomments{Adopted extinction law as a function of
frequency. Values are relative to the
extinction at V.}
\tablerefs{RL85: Rieke and Lebofsky 1985; SM79: Savage and Mathis 1979}
\end{planotable}
\end{document}