\begin{table}%t1
\caption{\label{tab1}Observing parameters and estimated integration times.}
%\centering
\small
\begin{tabular}{lrrrr}
\hline \hline
Centre frequency [GHz] & 2.64 &  4.85         &  8.35    &  10.45   \\
\hline
Bandwidth [MHz]        & 80   &    500        &  1100    &  300    \\
System Temp.(zenith) [K] & 17 & 27            & 22       & 53        \\
Scan length [$'$]      & 16   &  12           &  8       &  6        \\
Scan speed [$'$/min]   & 45   &   45          & 40       &  30      \\
\hline
\end{tabular}
\end{table}