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\title{EVOLUTION OF GLOBAL PROPERTIES OF POWERFUL}
\title{RADIO SOURCES II---HYDRODYNAMICAL SIMULATIONS}
\title{IN A DECLINING DENSITY ATMOSPHERE AND}
\title{SOURCE ENERGETICS}
\author{Joel C.\ Carvalho\/\altaffilmark{1} and Christopher P.\ O'Dea}
\affil{Space Telescope Science Institute}
\affil{3700 San Martin Drive}
\affil{Baltimore, MD 21218}
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\centerline{\titlelarge To be published in \emph{The Astrophysical Journal, Supplement Series}}
\received{22 May 2001} \accepted{27 November 2001}
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\altaffiltext{1}{\titlelarge Departamento de Fisica, UFRN, C.P.\ 1661, CEP 59072-970, Natal, RN, Brazil}
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