\begin{table}%t1
%\centering
\par
\caption{\label{obssum}Summary of observations.}  \vspace*{-2mm}
\par
\begin{tabular}{lccc}
\hline\hline\noalign{\smallskip}
Obs. ID &  Start time &  $T_{\rm obs}$ & Range\tablefootmark{a}\\
           &      [UTC]             &   [min.]     & [$\mu$m] \\
\hline\noalign{\smallskip}
1342186536 &  30-Oct.-2009 00:58:36   &  116    &  51--72$^k$, 102--145$^n$  \\
1342186537 &  30-Oct.-2009 03:01:48   &  133    &  51--62$^l$, 150--186$^n$ \\
1342186538 &  30-Oct.-2009 05:22:32   &  203    &  60--73$^l$, 180--220$^n$ \\
1342186539 &  30-Oct.-2009 08:53:20   &  151    &  68--85$^m$, 120--171$^n$ \\
1342186540 &  30-Oct.-2009 11:31:41   &  236    &  82--102$^m$, 165-220$^n$ \\
1342186571 & 31-Oct.-2009 14:35:00& 82 & 118.4--120.9$^n$\\
\hline
\end{tabular}\vspace*{-2mm}
\tablefoot{\tablefoottext{a}{Grating order and filter: $k = 2$A, $l = 3$A, $m = 2$B, $n = 1$ red.}}\vspace*{-3mm}
\end{table}