**Table 1:** Data of observations.
Orbit	Observing date	PN mode	Filter	On time		count rate	RGS
	(UT)			s	(s)	on chip	count rate
084	May 25, 2000: 03:53-10:11	Tim	Thick	16279	16781	373.97	$18.6\pm2.2$
084	May 25, 2000: 10:35-19:37	SW	Thick	30203	21159	300.13	n/a
165	Nov. 02, 2000: 00:10-10:25	SW	Thick	34560	24242	133.78	$6.4\pm1.3$
171-1	Nov. 13, 2000: 22:22-11:20 $^{\dagger}$	SW	Thick	36553	25640	384.59	$18.5\pm2.1$
171-2 $^{\clubsuit}$	Nov. 14, 2000: 13:54-01:51 $^{\dagger}$	SW	Thick	33384	23417	372.85	$20.6\pm2.2$
259	May 08, 2001: 09:10-19:59	SW	Thin	36678	25727	407.42	$14.0\pm1.9$
440-1 $^{\clubsuit}$	May 04, 2002: 16:49-03:03 $^{\dagger}$	LW	Thick	36715	34345	108.21	$6.6\pm1.5$
440-2 $^{\clubsuit}$	May 05, 2002: 03:51-09:24	LW	Thick	17059	15954	78.01	n/a

$^{\dagger}$ : Next day.
$^{\clubsuit}$ : Source in off-set position.

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