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\title{The Correlations between Planetary Nebula Morphology and Central Star
Evolution. Analysis of the Northern Galactic Sample.}
\author{Letizia Stanghellini,\altaffilmark{1} Eva Villaver}
\affil{Space Telescope Science Institute\\
3700 San Martin Drive\\
Baltimore MD 21218, USA\\
lstanghe@stsci.edu; villaver@stsci.edu}

\author{Arturo Manchado\/\altaffilmark{2}}
\affil{Instituto de Astrofisica de Canarias\\
via Lactea s/n\\
La Laguna\\
E-38200 Santa Cruz de Tenerife, Spain\\
amt@iac.es}

\author{Martin A.\ Guerrero}
\affil{Department of Astronomy\\
University of Illinois at Urbana-Champaign\\
1002 W.\ Green Street\\
Urbana, IL 61801\\
mar@uiuc.edu}
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\centerline{\titlelarge To be published in the 20 August 2002 issue of \emph{The Astrophysical Journal}}
\received{18 March 2002}
\accepted{10 April 2002}
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\altaffiltext{1}{Affiliated to the Astrophysics Division, Space Science
Department of ESA; on leave, INAF--Osservatorio Astronomico di Bologna}
\altaffiltext{2}{Consejo Superior de Investigaciones Cientificas, Spain}
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