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% Table 1: Pre-flare radio data
\begin{deluxetable}{lll}
\tablenum{1}
\tablecaption{Average radio flux densities before the $\gamma$--ray
flare (pre-flare state).
\label{Pre-flare radio}
}
\tablehead{
\colhead{Freq.} & \colhead{Flux density} & \colhead{Source of data} \\ 
\colhead{(GHz)} & \colhead{(Jy)}    & \colhead{}
}
\startdata
1.6  & $1.08\pm0.02$ & ATCA\\
2.3  & $1.4\pm0.03$ & ATCA\\
4.8  & $2.94\pm0.06$ & ATCA\\    
8.6  & $4.63\pm0.09$ & ATCA\\
90   & $2.89\pm0.06$ & SEST, IRAM\\
230  & $2.00\pm0.07$ & SEST, IRAM\\ 
\enddata
\tablecomments{The data are from IRAM (Reuter et al. 1997),
and SEST and ATCA observations (this paper).}
\end{deluxetable}

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