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\title{Comparative Absorption and Emission}
\title{Abundance Analyses of Nebulae:}
\title{Ion Emission Densities for IC~418\altaffilmark{1}}
\author{Robert Williams}
\affil{Space Telescope Science Institute\\
3700 San Martin Drive\\
Baltimore, MD 21218\\
wms@stsci.edu}
\author{Edward B.\ Jenkins}
\affil{Princeton University Observatory\\
Princeton, NJ 08544\\
ebj@astro.princeton.edu}
\author{Jack A.\ Baldwin and Brian Sharpee}
\affil{Department of Physics and Astronomy\\
Michigan State University\\
East Lansing, MI 48824\\
baldwin@pa.msu.edu, sharpee@pa.msu.edu}
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\centerline{\titlelarge To be published in the 3 February 2003 issue of \emph{P.A.S.P.}}
\received{14 October 2002}
\accepted{24 October 2002}
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\altaffiltext{1}{\titlelarge Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the ST~ScI, which is operated by AURA, Inc.\ under NASA contract NAS 5-26555, and on observations made at CTIO/NOAO, which is operated by AURA, Inc.\ under cooperative agreement with the NSF.}
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