Table 1: Sample of sources studied in this paper. We give their name, their coordinates (J2000 and galactic), the total galactic column density of neutral hydrogen ( $N_{\rm H}(H {\sc i})$ ) and the total galactic column density of molecular hydrogen ( $N_{\rm H}({\rm H}_{\rm 2})$ ) in the line of sight, the X-ray column density of the source ( $N_{\rm Hx}$ ), their type (SFXT or OBS - obscured sources) and their spectral type (SpT). Their spectral classifications come from optical/NIR spectroscopy, reported in the following references (Ref): c: Chaty et al. (2008), f: Filliatre & Chaty (2004), i: in 't Zand et al. (2006), n1: Negueruela et al. (2005), n2: Negueruela et al. (2006a), n3: Nespoli et al. (2007), p: Pellizza et al. (2006), t: Tomsick et al. (2006).
Sources $\alpha ({\rm J2000})$ $\delta ({\rm J2000})$ l b $N_{\rm H}(H {\sc i})(10^{22})$ $N_{\rm H}({\rm H}_{\rm 2})(10^{22})$ $N_{\rm Hx} (10^{22})$ Type SpT Ref.

IGR J16195-4945 16  19  32.20 -49  44  30.7 333.56 0.339 2.2 5.4 7.0 SFXT? O/B t

IGR J16207-5129 16  20  46.26 -51  30  06.0 332.46 -1.050 1.7 2.2 3.7 OBS O/B t

IGR J16318-4848 16  31  48.60 -48  49  00.0 335.62 -0.448 2.1 3.6 200.0 OBS sgB[e] f

IGR J16320-4751 16  32  01.90 -47  52  27.0 336.30 0.169 2.1 4.4 21.0 OBS O/BI c

IGR J16358-4726 16  35  53.80 -47  25  41.1 337.01 -0.007 2.2 7.3 33.0 OBS sgB[e] c

IGR J16418-4532 16  41  51.00 -45  32  25.0 339.19 0.489 1.9 3.6 10.0 SFXT? O/B c

IGR J16465-4507 16  46  35.50 -45  07  04.0 340.05 0.135 2.1 5.9 60.0 SFXT B0.5I n1

IGR J16479-4514 16  48  06.60 -45  12  08.0 340.16 -0.124 2.1 8.2 7.7 SFXT? O/BI c

IGR J17252-3616 17  25  11.40 -36  16  58.6 351.50 -0.354 1.6 3.9 15.0 OBS O/BI c

IGR J17391-3021 17  39  11.58 -30  20  37.6 358.07 0.445 1.4 4.5 30.0 SFXT 08Iab(f) n2

IGR J17544-2619 17  54  25.28 -26  19  52.6 3.26 -0.336 1.4 7.8 1.4 SFXT O9Ib p

IGR J19140+0951 19  14  04.23 +09  52  58.3 44.30 -0.469 1.7 3.7 6.0 OBS B1I n3

**Table 1:** Sample of sources studied in this paper. We give their name, their coordinates (J2000 and galactic), the total galactic column density of neutral hydrogen ( $N_{\rm H}(H {\sc i})$ ) and the total galactic column density of molecular hydrogen ( $N_{\rm H}({\rm H}_{\rm 2})$ ) in the line of sight, the X-ray column density of the source ( $N_{\rm Hx}$ ), their type (SFXT or OBS - obscured sources) and their spectral type (SpT). Their spectral classifications come from optical/NIR spectroscopy, reported in the following references (Ref): c: Chaty et al. (2008), f: Filliatre & Chaty (2004), i: in 't Zand et al. (2006), n1: Negueruela et al. (2005), n2: Negueruela et al. (2006a), n3: Nespoli et al. (2007), p: Pellizza et al. (2006), t: Tomsick et al. (2006).
Sources	$\alpha ({\rm J2000})$	$\delta ({\rm J2000})$	l	b	$N_{\rm H}(H {\sc i})(10^{22})$	$N_{\rm H}({\rm H}_{\rm 2})(10^{22})$	$N_{\rm Hx} (10^{22})$	Type	SpT	Ref.
IGR J16195-4945	16 19 32.20	-49 44 30.7	333.56	0.339	2.2	5.4	7.0	SFXT?	O/B	t
IGR J16207-5129	16 20 46.26	-51 30 06.0	332.46	-1.050	1.7	2.2	3.7	OBS	O/B	t
IGR J16318-4848	16 31 48.60	-48 49 00.0	335.62	-0.448	2.1	3.6	200.0	OBS	sgB[e]	f
IGR J16320-4751	16 32 01.90	-47 52 27.0	336.30	0.169	2.1	4.4	21.0	OBS	O/BI	c
IGR J16358-4726	16 35 53.80	-47 25 41.1	337.01	-0.007	2.2	7.3	33.0	OBS	sgB[e]	c
IGR J16418-4532	16 41 51.00	-45 32 25.0	339.19	0.489	1.9	3.6	10.0	SFXT?	O/B	c
IGR J16465-4507	16 46 35.50	-45 07 04.0	340.05	0.135	2.1	5.9	60.0	SFXT	B0.5I	n1
IGR J16479-4514	16 48 06.60	-45 12 08.0	340.16	-0.124	2.1	8.2	7.7	SFXT?	O/BI	c
IGR J17252-3616	17 25 11.40	-36 16 58.6	351.50	-0.354	1.6	3.9	15.0	OBS	O/BI	c
IGR J17391-3021	17 39 11.58	-30 20 37.6	358.07	0.445	1.4	4.5	30.0	SFXT	08Iab(f)	n2
IGR J17544-2619	17 54 25.28	-26 19 52.6	3.26	-0.336	1.4	7.8	1.4	SFXT	O9Ib	p
IGR J19140+0951	19 14 04.23	+09 52 58.3	44.30	-0.469	1.7	3.7	6.0	OBS	B1I	n3

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