\begin{table}%t1
%\centering
\par
  \caption{Main characteristics of the upcoming millimetric observatories ACT,
  SPT, and our simulated instrument.
  \label{tab:instruments}}
    \begin{tabular}{cccc}
    \hline \hline
      & Bands & {\it FWHM} & $\Delta T$/beam \\
      & (GHz) & (\arcmin)& ($\mu \rm K$) \\
      \hline
      ACT  & 145, 225, 265 & 1.7, 1.1, 0.93 & 2, 3.3, 4.7\\
      SPT  &  150, 219, 274 & 1, 0.69, 0.56 & 2.5, 3.0, 2.65\\
      simulation & 217 & 1 & 1 \\
      \hline
    \end{tabular}
\end{table}