XMM-Newton Science Analysis System
specgroup (specgroup-1.7) [xmmsas_20190531_1155-18.0.0]
This sets spectral groups such that each group contains a minimum
signal-to-noise ratio (S/N). The calculation of the ratio will take
the area-normalised background into account if a background spectrum is
provided. e.g.:
would make groups with a minimum S/N of 6 where S/N is given by:
![\begin{displaymath}
S/N = ( source - background * areanorm ) /
sqrt( source + background * areanorm^2)
\end{displaymath}](img11.png) |
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XMM-Newton SOC/SSC -- 2019-06-02