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: http://xmm.vilspa.esa.es/sas/7.1.0/doc/eregionanalyse/node17.html
Дата изменения: Mon Jul 9 10:18:11 2007 Дата индексирования: Sat Dec 22 14:10:47 2007 Кодировка: Поисковые слова: закон вина |
(1) |
where is the counts within the source region, is the total background counts and , are the area of the source and background regions respectively.
The background is simply scaled by the respective box areas; no vignetting correction of any sort is made. The error is calculated from photon statistics as:
(2) |
NB: This is only reliable for circular source regions, see section 3.2.7