\begin{table}%t1
  \caption{\label{tab:spec}Summary of experimental designs.}
  %\centering
\par
  \begin{tabular}{lccccc}
    \hline
    \hline
    Experiment & Frequency & Beam FWHM & NET & $T_{\rm obs}$ & Sky coverage \\
    & (GHz) & (')& ($\mu {\rm K} \sqrt{s} $) & (yr) &($f_{\rm sky}$)\\
    \hline
    \multirow{2}{*}{PLANCK} & 30, 44, 70 & 33, 24, 14 &  96, 97, 97 & 1.2 & 1 \\
    &  100, 143, 217, 353 &  10, 7.1, 5, 5 &  41, 31, 51, 154 &  & \\
    \multirow{2}{*}{EPIC-LC} & 30, 40, 60 & 155, 116, 77 & 28, 9.6, 5.3 & 2 & 1\\
    & 90, 135, 200, 300 & 52, 34, 23, 16 & 2.3, 2.2, 2.3, 3.8 &  & \\
    \multirow{2}{*}{EPIC-CS} & 30, 45, 70, 100 & 15.5, 10.3, 6.6, 4.6 & 19, 8, 4.2, 3.2 & 4 & 1\\
    & 150, 220, 340, 500 & 3.1, 2.1, 1.4, 0.9 & 3.1, 5.2, 25, 210 &  & \\
    \multirow{2}{*}{EPIC-2m} & 30, 45, 70, 100 & 26, 17, 11, 8 & 18, 7.6, 3.9, 3.0 & 4 & 1\\
    & 150, 220, 340, 500(,800) & 5, 3.5, 2.3, 1.5(, 0.9) & 2.8, 4.4, 20, 180(, 28k) & & \\
    Ground-Based & 97, 150, 225 & 7.5, 5.5, 5.5 &  12, 18, 48 & 0.8 & 0.01 \\
    \multirow{2}{*}{Deep field} & 30, 45, 70, 100 & 15.5, 10.3, 6.6, 4.6 & 19, 8, 4.2, 3.2 & 4 & 0.01\\
    & 150, 220, 340, 500 & 3.1, 2.1, 1.4, 0.9 & 3.1, 5.2, 25, 210 &  & \\
    \hline
  \end{tabular}
\end{table}