XMM-Newton Science Analysis System


specgroup (specgroup-1.7.1) [22.0.0-9173c7d25-20250127]

Treatment of the last bin and other ungrouped bins

In the case where the last few bins of the spectrum do not meet the required statistical criterion for a normal group it may be treated in several ways:

1. Leave the bins ungrouped and set their quality to bad:

   lastbin="setbad"

2. Group them and set their quality good:

   lastbin="owngroup"

3. Add these bins into the final group:

   lastbin="addtogroup"

The default is to add these bins onto the adjacent group. A different option may be selected by e.g.

In principle, a set of user-defined ranges could leave ungrouped bins in the middle of the spectrum. These will also be treated according to the lastbin parameter setting.