\begin{table}%T1
      \caption{Observing log.\label{obslog}}
          %\scriptsize
       $$
         \begin{array}{lllll}
            \hline
            \hline
           \noalign{\smallskip}
            &  & \multicolumn{3}{l}{\rm 2001\ August\ 12}\\
            \noalign{\smallskip}
            \hline
            \noalign{\smallskip}
            {\rm Instrument}  &  & {\rm UT\ range}   &  & {\rm JD\  2~452~133.5 +}  \\
            \noalign{\smallskip}
            \hline
            \noalign{\smallskip}
            {\rm PN}     &\quad   &  04:21:29 {-} 22:37:29 &\quad & 0.18147 {-} 0.94270\\
            {\rm MOS1}   &\quad   &  04:01:29 {-} 22:35:08 &\quad & 0.16770 {-} 0.94106\\
            {\rm MOS2}   &\quad   &  04:01:29 {-} 22:35:08 &\quad & 0.16770 {-} 0.94106\\
            {\rm RGS1}   &\quad   &  03:53:59 {-} 22:37:34 &\quad & 0.16249 {-} 0.94275\\
            {\rm RGS2}   &\quad   &  03:53:59 {-} 22:37:32 &\quad & 0.16249 {-} 0.94273\\
            {\rm OM}     &\quad   &  03:58:58 {-} 17:43:46 &\quad & 0.16595 {-} 0.73873\\
           \noalign{\smallskip}
            \hline
         \end{array}
      $$\normalsize
      \vskip -0.6truecm
   \end{table}