\begin{table}%t1
      \caption{\label{modes}Instrument modes and exposure times.}
$$
         \begin{array}{p{1.5in}p{2in}p{1.5in}}
            \hline\hline
            \noalign{\smallskip}
            Instrument      &  Mode & Exposure time (seconds) \\
            \noalign{\smallskip}
            \hline
            \noalign{\smallskip}
            EPIC-MOS 1 & Large Window (medium filter) & 41~388    \\
            EPIC-MOS 2 & Full Frame (medium filter) & 41~388       \\
            EPIC-PN & Small Window (medium filter) & 40~698  \\
            RGS 1 & Spectroscopy & 41~467             \\
            RGS 2 & Spectroscopy & 41~464             \\
            OM & Image (UVW2 filter) & 28~500            \\
            \noalign{\smallskip}
            \hline
         \end{array}
          $$   
  \end{table}