\begin{table}%t6
 \caption{\label{table:oofbl_error}Stdev $\sigma_{ub}$ of the $1/f$ Baseline Error. }
 %\centering
\small
 \begin{tabular}{cccc}
 \hline\hline
 $\tbase$ & $a$ and $b$ & $(a+b)/2$ & $(a-b)/2$ \\
           & ($\mu$K) & ($\mu$K) & ($\mu$K) \\
 \hline
 5 s     & 1.790 & 0.995 & 1.486 \\
 15 s    & 1.894 & 1.075 & 1.557 \\
 1 min   & 1.404 & 0.765 & 1.177 \\
 1 h     & 1.360 & 0.726 & 1.142 \\
 \hline
 \end{tabular}
\end{table}