The metal contents of two groups of galaxies | Astronomy & Astrophysics (A&A)

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Table 1

Log of the observations used.

	Exposure	Exposure	Exposure		Position
ObsID	MOS	pn	RGS	Start date	angle
	(ks)	(ks)	(ks)	(Y-M-D)	(degrees)^a

NGC 5044
0037950101	21	12	17	2001-01-12	110
0554680101	104	86	95	2008-12-27	114

Total exposure	125	98	112

NGC 5813
0302460101	30	22	25	2005-07-23	291
0554680201	60	44	51	2009-02-11	104
0554680301	60	43	50	2009-02-17	102

Total exposure	150	109	126

Notes. Quoted exposures are after filtering the soft-proton background.

^(a)

The zeropoint of the position angle is the celestial north. The positive position-angle direction is towards the east.

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