\begin{table}%t1    
\small
\caption{Flux densities $S_\nu(250)$ at 250 GHz in a 11${''}$ beam of 17P/Holmes. 
         $\Delta$ and $r$ are the comet's distance from Earth and Sun 
         at time $T$ after the outbreak.}
         %\centerline
$$
\begin{tabular}{r@{\ }l r c c r@{~~}c@{~~}l l}\hline
\hline
\multicolumn{2}{c}{Date} & \makebox[2em][c]{$T$} & $\Delta$ & $r$ &
                           \multicolumn{3}{c}{$S_\nu(250)$}     & Ref.\\
      &                  & days                &    AU    &  AU &
                           \multicolumn{3}{c}{mJy}              & \\[1ex]\hline
Oct.  &27.105 & 3.3  & 1.630 & 2.447 &64.5 & $\pm$ &2.8 & (1) \\
      &28.205 & 4.4  & 1.628 & 2.451 &55.5 & &2.6 & (2) \\
Nov.  &16.950 & 24.2 & 1.634 & 2.530 &16.0 & &4.3 & (3) \\
      &18.769 & 26.0 & 1.639 & 2.538 &11.6 & &0.9 & (3) \\
      &20.846 & 28.0 & 1.645 & 2.546 & 5.1 & &1.1 & (3) \\
      &23.998 & 31.2 & 1.657 & 2.558 & 5.9 & &0.7 & (3) \\
      &25.929 & 33.1 & 1.665 & 2.566 & 7.1 & &1.3 & (3) \\
      &28.142 & 35.3 & 1.675 & 2.575 & 4.5 & &1.1 & (3) \\
Dec.  &03.838 & 41.0 & 1.710 & 2.599 & 5.5 & &1.1 & (3) \\
      &18.333 & 55.5 & 1.850 & 2.670 & 4.1 & &1.5 & (3) \\
\hline
\end{tabular}
$$
\medskip
\par
(1) Extrapolated from the flux of $2.3\pm0.1$ mJy observed at 88.6 GHz by 
           Boissier el al. (see Sect.~\ref{s:obs}).\\
(2) Extrapolated from $2.1\pm0.1$ mJy observed at 90.6 GHz (ibid.).\\
(3) This paper.
\label{tab1} 
\end{table}