|The input units for ranges have been set to keV but a redistribution matrix hasn't been supplied.|
|Only one statistical method, e.g. minimum counts, minimum S/N or ratio above background, can be specified|
|The ranges must be entered as '1-10' or '1:10' if specified in channels or as '2.0:4.53' or '2.0-4.53' if specified in keV.|
|The specified energy range is outside the range of energies contained in the spectrum|
|The start bin for regular binning must be >= 0|
|The template spectrum has a different number of channels from spectrum to be grouped.|
|There has been a clash between the ranges and regular binning requested.|
|A bin which has been requested to be set bad by the setbad option has already been grouped and so will stay as a good channel.
corrective action: leave channel as good
|After grouping has completed and ungrouped channels are treated according to the lastbin parameter selection. Sometimes it is impossible to find a contiguous group to add a given channel to. Contiguous channels which fall in this category are used to form a new group.
corrective action: create a new group
XMM-Newton SOC -- 2021-11-30