\begin{table}%t2
\caption{Fluxes of the flux calibrator 3C48, based
on the 1995.2~VLA~coefficients (Perley \& Taylor \cite{Perley+Taylor99}). The two values
for each entry correspond to the two 50~MHz sidebands (IF1 and~IF2).}
\label{table fluxes flux calibrator}
%\centering
\par
$$\begin{tabular}{r@{.}lrrrrr}
\hline \hline
\multicolumn{2}{c}{$\lambda$} & \multicolumn{2}{c}{Frequency (GHz)} & 
   \multicolumn{2}{c}{Flux (Jy)} \\
\multicolumn{2}{c}{(cm)} & \multicolumn{1}{c}{IF1} & \multicolumn{1}{c}{IF2} & 
   \multicolumn{1}{c}{IF1} & \multicolumn{1}{c}{IF2} \\
\hline
 3&6 & 8.485 & 8.435 &  3.1449 &  3.1637 \\
 6&  & 4.885 & 4.835 &  5.4054 &  5.4585 \\
18&  & 1.665 & 1.635 & 13.9788 & 14.1852 \\
20&  & 1.465 & 1.385 & 15.4935 & 16.1955 \\
\hline
\end{tabular}$$
\end{table}