**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	691	92	594 x n	1377
MOS 1	Large Window	691	92	594 x n	1377
MOS 1	Small Window	691	92	594 x n	1377
MOS 1	Timing	691	92	833 x n	1616
MOS 1	Refresh Frame Store	691	92	610 x n	1393
MOS 2	Full Frame	690	87	616 x n	1393
MOS 2	Large Window	690	87	616 x n	1393
MOS 2	Small Window	690	87	616 x n	1393
MOS 2	Timing	690	87	865 x n	1642
MOS 2	Refresh Frame Store	690	87	610 x n	1387
pn	Full Frame	219	72	2947 x n	3238
pn	Large Window	219	72	3306 x n	3597
pn	Small Window	219	72	1569 x n	1860
pn	Timing	219	72	3326 x n	3617
pn	Burst	219	72	2766 x n	3057
pn	Extended Full Frame	219	72	5242 x n	5533
pn	Mosaic	219	72	3898 x n	4189
RGS 1	Spectroscopy	997	17	80 x n	1094
RGS 1	Small Window	997	17	73 x n	1087
RGS 2	Spectroscopy	1002	17	83 x n	1102
RGS 2	Small Window	1002	17	189 x n	1148
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	RGS Image	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.