\begin{table}%t11
  \caption{\label{table:umap}rms of the unmodeled $1/f$ noise maps.}
  %\centering
\small
 \begin{tabular}{llllll}
 \hline\hline
 $\tbase$ & Eqs.~((\ref{sigu_apx_num}), (\ref{Iapx_u})) &
 Eq.~(\ref{Iapx_u}) & $I_{\rm rms}$ & $Q_{\rm rms}$ & $U_{\rm rms}$ \\
           & ($\mu$K) & ($\mu$K) & ($\mu$K) & ($\mu$K) & ($\mu$K) \\
 \hline
 7.5 s   & 2.994 & 3.081 & 3.062 & 4.314 & 4.358 \\
 15 s    & 3.727 & 3.901 & 3.852 & 5.450 & 5.526 \\
 1 min   & 6.053 & 6.313 & 5.778 & 8.128 & 8.225 \\
 1 h     &       &       & 9.357 & 13.02 & 13.178 \\
 \hline
 \end{tabular}
\end{table}