**Overhead Times Table:** *Overhead times of available instrument modes in seconds for an observation containing only one* (n=1) exposure. For more exposures the overheads increase according to the formula, substituting n with the number of exposures. Note, that these times may change throughout the mission.
Instrument	Mode¹	Obs.start	Obs.end	Exposure	Total Overhead
MOS 1	Full Frame	680	92	605 x n	1377
MOS 1	Large Window	680	92	600 x n	1372
MOS 1	Small Window	680	92	615 x n	1387
MOS 1	Timing	680	92	870 x n	1642
MOS 1	Refresh Frame Store	680	92	610 x n	1382
MOS 2	Full Frame	680	87	605 x n	1372
MOS 2	Large Window	680	87	600 x n	1367
MOS 2	Small Window	680	87	615 x n	1382
MOS 2	Timing	680	87	870 x n	1637
MOS 2	Refresh Frame Store	680	87	610 x n	1377
pn	Full Frame	13	72	2874 x n	2959
pn	Large Window	13	72	3233 x n	3318
pn	Small Window	13	72	1438 x n	1523
pn	Timing	13	72	3175 x n	3260
pn	Burst	13	72	2615 x n	2700
pn	Extended Full Frame	13	72	5169 x n	5254
pn	Mosaic	13	72	3826 x n	3911
RGS 1	Spectroscopy	997	17	80 x n	1094
RGS 1	Spectroscopy (HCR)	997	17	57 x n	1071
RGS 1	Small Window	997	17	57 x n	1071
RGS 2	Spectroscopy	1002	17	83 x n	1102
RGS 2	Spectroscopy (HCR)	1002	17	84 x n	1103
RGS 2	Small Window	1002	17	118 x n	1137
OM	Full Frame High Resolution	1051	34	8280 x n	9365
OM	Full Frame Low Resolution	1051	34	2909 x n	3994
OM	Science User Defined	1338	34	307 x n	1679
OM	EPIC Image	1338	34	1608 x n	2980
OM	EPIC Image Fast	1338	34	1608 x n	2980
OM	RGS Image	1338	34	1608 x n	2980
OM	RGS Image Fast	1338	34	1608 x n	2980

Note to Table:
1) For a detailed description of the different instrument modes see § 5.2 or the UHB.