Notice data channels. (See also ignore.)
XSPEC> notice <range1> <range2> ... <rangeN>
where <rangeI> =:: {<data set range>:<channel range> | <channel 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> | <data set>}, where <init data set>, <last data set>, and <data set> are data set numbers, in the order they were input with the data command. <channel range> =:: {<initial channel> - <last channel> | <channel>}. If <channel range> are integers then channels will be used or if reals then energies (or wavelenths if setplot wave has been specified). 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 a while). The energy range covered by the current response matrix may thereby be increased.