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: http://xmm.vilspa.esa.es/sas/7.1.0/watchout/7.0/backscal_in_timing.shtml
Дата изменения: Unknown Дата индексирования: Sat Dec 22 14:40:36 2007 Кодировка: |
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When the SAS task backscale calculates the area of a source or background region from a Timing mode observation, it currently assumes that the region is contiguous. Although it is tempting to extract a single background spectrum from regions on both sides of the source, this will currently produce a wrong value of the BACKSCAL keyword. A simple workaround is to either use a single box for the background or to extract two backgrounds individually and then manually add the BACKSCAL values. This also applies to a source region which may exclude the central brightest columns if the source is piled-up.
This bug will be fixed in the next SAS release.