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The British Wide Field Camera (WFC) on the German/US/UK
spacecraft consists of a 5-degree diameter field of view
telescope with a curved
microchannel plate detector at the focus. The WFC is coaligned with the
German X-ray Telescope.
ROSAT performed a 6-month all-sky survey in the interval July 30, 1990 to
January 25, 1991, during which 96 percent of the sky was covered. During
the survey two filters in the WFC were alternated daily to provide two
EUV passbands. These were S1 [60-140 A (90-206 eV)] and S2 [110-200 A
(62-110 eV)]. Sky coverage was greatest at the ecliptic poles, where
integrated exposures reached 70,000 seconds in each filter; at the
ecliptic equator exposures were lowest, being around 1,500 seconds per