Ignore data channels. (See also notice.)
XSPEC> ignore <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 that they were input with the data command. <channel range> =:: { <initial channel> - <last channel> | <channel>}. If integers are given for the channel ranges then channels will be used while if reals are given then energies (or wavelenths if setplot wave has been specified). 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 memory. Thus, the energy range covered by the current response matrix may be reduced.