\begin{table}%t10
  \caption{\label{table:wblmap}rms of the white noise baseline maps.}
 %\centering
\small
 \begin{tabular}{cccc}
 \hline\hline
 $\tbase$ & $I_{\rm rms}$ & $Q_{\rm rms}$ & $U_{\rm rms}$ \\
          & ($\mu$K) & ($\mu$K) & ($\mu$K) \\
 \hline
 2.5 s   & 6.729 & 9.303 & 9.580 \\
 15 s    & 2.319 & 3.291 & 3.356 \\
 1 min   & 1.181 & 1.678 & 1.715 \\
 1 h     & 1.088 & 1.552 & 1.590 \\
 \hline
 \end{tabular}
\end{table}