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\title{The classification of BL Lacertae Objects:}
\title{the Ca H\&K break}
\author{Hermine Landt,\altaffilmark{1} Paolo Padovani\/\altaffilmark{2,3}}
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\affil{Space Telescope Science Institute\\
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3700 San Martin Drive\\
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Baltimore, MD 21218}
\author{Paolo Giommi}
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\affil{ASI Science Data Center\\
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c/o ESRIN\\
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Via G.~Galilei\\
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I-00044 Frascati, Italy}
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\centerline{\titlelarge To be published in \emph{M.N.R.A.S.}}
\received{8 April 2002}
\accepted{2 July 2002}
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\altaffiltext{1}{Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany}
\altaffiltext{2}{Affiliated to the Astrophysics Division, Space Science Department, European Space Agency}
\altaffiltext{3}{On leave from Dipartimento di Fisica, II Universit\`a di Roma ``Tor Vergata,'' Via della Ricerca Scientifica 1, I-00133 Roma, Italy}
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