\begin{table}%t1
\caption{Journal of Perot-Fabry observations.\label{tab1}} 
%\centerline
{\begin{tabular}[t]{llll}
\hline\hline \noalign{\medskip}
Observations & Telescope & CFHT 3.6~m & ESO 3.6~m \\
             & Equipment & MOS/FP @ Cassegrain & CIGALE @ Cassegrain\\
             & Date & 1996, August, 27--29 & 1995, August, 21--24 \\
             & Seeing & $<$1\arcsec & $\sim$1\arcsec \\
Calibration & Neon Comparison light & $\lambda$ 6598.95~\AA &  $\lambda$ 6598.95~\AA \\
Perot--Fabry & Interference Order & 1162 @ 6562.78~\AA & 796 @ 6562.78~\AA \\
         & Free Spectral Range at~H$\alpha$ & 265~km~s$^{-1}$ & 378~km~s$^{-1}$ \\
         & \textit{Finesse}$^{(1)}$ at~H$\alpha$ & 12 & 12\\
         & Spectral resolution at~H$\alpha$ & 13672$^{(2)}$ & 9375$^{(2)}$\\
Sampling & Number of Scanning Steps & 24 & 24 \\
     & Sampling Step & 0.24~\AA\ (11~km~s$^{-1}$) & 0.35~\AA\ (16~km~s$^{-1}$)\\
%     & Total Field & 440''$\times $440'' (512$\times $512 px$^2$)^{\mathrm{a}} & 170''$\times$170'' (256$\times$256 px$^2$) \\
     & Total Field & $440\arcsec \times 440\arcsec$ ($512 \times 512$~px$^2$) & $170\arcsec \times 170\arcsec$ ($256\times 256$ px$^2$) \\
         & Pixel Size & $0.86\arcsec^{(3)}$ & 0.91\arcsec  \\
Detector & & STIS 2 CCD & IPCS  \\
 \hline
\end{tabular}}
$^{(1)}$ {Mean \textit{Finesse} through the field of view.
\\}
$^{(2)}$ {For a signal to noise ratio of 5 at the sample
step.
\\}
$^{(3)}$ {After binning $2\times2$.}
\end{table}