Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/sas/7.0.0/doc/rgsfilter/node11.html
Дата изменения: Thu Jun 29 00:34:52 2006
Дата индексирования: Sat Dec 22 11:47:40 2007
Кодировка:
Поисковые слова: trifid nebula

XMM-Newton Science Analysis System


rgsfilter (rgsfilter-1.17.1) [xmmsas_20060628_1801-7.0.0]

Meta Index / Home Page

Comments

The exposure maps suffer from a minor potential double-counting error. If a bad pixel is not known to the DPP, and is not present in the telemetry, and is of the variety that tends to be hot, then it is possible that it has been rejected on-board. Such bad pixels effectively subtract twice their active time from the map, once as an individual bad pixel, and again in the fractional exposure applied to the entire node.