Notice data channels. (See also ignore.)
XSPEC> notice <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 <init data set>, <last data
set>, and <single data set> are data set numbers, in the
order they were input with the data 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 1 is used for the initial
channel. Channels remain noticed until they are explicitly ignored with the
ignore command. When a data set is replaced by another data set with a
different number of PHA channels, all input channels automatically are
noticed. When a channel is noticed, the response matrix must be recreated to
include the new channel's response. Thus all the response files are re-read
(this might take awhile). The energy range covered by the current response
matrix may thereby be increased.