**Table 3:** Fluxes, equivalent widths of the H $\alpha$ and H $\beta$ emission lines and the extinction coefficients C(H $\beta$ ) in the LSB regions.
Telescope	Region	Distance^a	Aperture^b	F(H $\alpha$ )^c	F(H $\beta$ )^c	EW(H $\alpha$ )^d	EW(H $\beta$ )^d	C(H $\beta$ )
MMT^e	a1	10.7	$1.5\times3.4$	$3.53 \pm0.14$	$1.25 \pm0.12$	$12.30 \pm0.75$	$2.72 \pm0.24$	$0.0 \pm0.03$
	a2	29.5	$1.5\times13.2$	...	...	...	...	...
4 m^f	a3	12.6	$2.0\times7.6$	$4.88 \pm0.39$	$1.88 \pm0.29$	$32.81 \pm2.32$	$7.72 \pm1.01$	$0.0 \pm0.04$
	e3	18.4	$2.0\times2.8$	$3.69 \pm0.17$	$1.19 \pm0.14$	$109.80 \pm1.41$	$16.57 \pm0.69$	$0.04 \pm0.06$
	a4	22.6	$2.0\times2.8$	...	...	...	...	...

$\textstyle \parbox{16.5cm}{ $^{a}$\space Distance in arcsec from the brightest ... ... $^{f}$\space Slit orientation with position angle ${\rm PA} = 48^{\circ}$ . }$

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