\begin{table}%t2
 \caption{Journal of spectroscopic observations for the H$\alpha$~line.}
 \label{table:2}
 \small%\centerline
{
 \begin{tabular}{@{}lclcccc@{}}
 \hline\hline
 Date & MJD & Grism$^{{a}}$
                & Exp. & {\it FWHM} & {\it EW} & $\Delta$v (peak sep)\\
      &     &       & (s) & (\AA) & (\AA) & (km s$^{-1}$)  \\
 \hline
 2006 May 23  & 53878& ~~G7  & 4 $\times$ 600 & 15.8 $\pm$ 6.6 &  2.34 $\pm$ 0.27 & -- \\
 2006 June 16 & 53902& ~~G8  & 3 $\times$ 600 & 10.3 $\pm$ 4.3 &  2.42 $\pm$ 0.29 & 539.4 \\
 2006 July 29 & 53945& ~~G7  & 2 $\times$ 1200& 10.0 $\pm$ 4.1 &  2.31 $\pm$ 0.18 & 542.6 \\
              &      & ~~G8  & 2 $\times$ 1800& 11.0 $\pm$ 4.7 &  2.20 $\pm$ 0.17 & 516.9 \\
              &      & ~~G15 & 1800  & 20.1 $\pm$ 8.4 &  2.65 $\pm$ 0.18 & -- \\
 2006 August 19& 53966& ~~G8  & 1800  & 10.6 $\pm$ 4.4 &  2.03 $\pm$ 0.19 & 516.1 \\
 2006 September 26& 54004 & ~~G8  & 1800  & 11.1 $\pm$ 4.7 &  2.58 $\pm$ 0.15 &
 465.8\\
              &           & ~~G14$^{{b}}$
                 & 3600  &     --        &      -- &  -- \\
 \hline
 \end{tabular}}
 \medskip
$^{a}$ Nominal dispersions for G7, G8, G14, and G15 are $\sim$1.5, 1.1, 1.4, and 3~\AA~pixel$^{-1}$, respectively.  Hence, 3~pixel resolutions at the H$\alpha$~line are: G7: $\sim$4.5~\AA, G8: $\sim$3.4~\AA, G14: $\sim$4.2~\AA\ and G15: $\sim$9.1. \\
$^{b}$ G14 is sensitive in 3275--6100~\AA~band and used for blue spectra.
\end{table}