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: http://xmm.vilspa.esa.es/calibration/documentation/CALHB/node902.html
Дата изменения: Tue Sep 20 19:45:21 2011 Дата индексирования: Mon Apr 11 03:35:58 2016 Кодировка: |
XMM makes regular observations of X-ray sources that are too weak for detection with the RGS, whose data are then dominated by the background. Observations of this type are the raw material for the TEMPLATEBCKGND CCFs. No assessment has yet been made of background variability.