Table 3: Performed duration and effective exposure time of both observations (April and September 2002). The difference between the performed and effective duration of the exposures is only due to overheads.

	Obs. 1		Obs. 2
Instrument	Performed	Effective	Performed	Effective
	duration	exposure	duration	exposure
	(s)	(s)	(s)	(s)
MOS1	13 122	12 855	13 667	13 402
MOS2	13 122	12 896	13 667	13 406
pn	10 546	9525	12 046	10 771