Ignore data channels. (See also notice.)
XSPEC> ignore <range1> <range2> ... <rangeN>
where the Ith range is <rangeI> =::
<data set range>:<channel/energy range> or <channel/energy range>.
If no <data set range> is given, then the previous range is used (the
initial default range is file one (1) only).
<data set range> =:: <init data set>-<last data set> or <single data set>
where i nit data set>, <last data set>, and <single data set> are data
set numbers, in the order that they were input with the d ata command.
<channel/energy range> =::
<initial channel/energy>-<last channel/energy>
or <single channel/energy>.
If integers are given for the channel/energy ranges then channels will be
used while if reals are given then energies. If only the
last channel is indicated, then a default value of one (1) is used for the
initial channel. Channels remain ignored until they are explicitly noticed
with the notice command, or if a data set is replaced with another data set
with a different number of PHA channels. When a channel is ignored, the counts
and other arrays are compressed, freeing up array space. Thus, the energy range
covered by the current response matrix may be reduced.