**Table 1:** Journal of Perot-Fabry observations.
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 ${}^{\prime\prime}$	$\sim$ 1 ${}^{\prime\prime}$
Calibration	Neon Comparison light	$\lambda$ 6598.95 Å	$\lambda$ 6598.95 Å
Perot-Fabry	Interference Order	1162 @ 6562.78 Å	796 @ 6562.78 Å
	Free Spectral Range at H $\alpha$	265 km s^-1	378 km s^-1
	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 Å (11 km s^-1)	0.35 Å (16 km s^-1)
	Total Field	$440\hbox{$^{\prime\prime}$ }\times 440\hbox{$^{\prime\prime}$ }$ ( $512 \times 512$ px²)	$170\hbox{$^{\prime\prime}$ }\times 170\hbox{$^{\prime\prime}$ }$ ( $256\times 256$ px²)
	Pixel Size	$0.86\hbox{$^{\prime\prime}$ }^{(3)}$	0.91 ${}^{\prime\prime}$
Detector		STIS 2 CCD	IPCS

⁽¹⁾ Mean Finesse through the field of view.
⁽²⁾ For a signal to noise ratio of 5 at the sample step.
⁽³⁾ After binning $2\times 2$ .