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ignore: ignore detector channels

Ignore data channels.(See also notice.)

Syntax:           ignore <range1> [ <range2>] ... [ <rangeN>]

           ignore bad


<rangeI> =:: <spectrum range>: <channel range> | <channel range>.

If no <spectrum range> is given, then the previous range is used (the initial default range is file one (1) only). The form of <spectrum range> is

<spectrum range> =::<init spectrum> – <last spectrum> | <spectrum>

where <init spectrum>, <last spectrum>, and <spectrum> are spectrum numbers, in the order that they were input with the data command. The form of channel range is

<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 wavelengths if setplot wave has been specified). Energy and wavelength units are determined by the setplot energy and wave settings.  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 spectrum is replaced.


Assume that 4 spectra have been read in, the first 2 with 100 channels and the last 2 with 50 channels.

XSPEC12> ignore **:1-10

//The first 10 channels of all 4 spectra are ignored

XSPEC12> ignore 80–**

//An attempt will be made to ignore channels >=80 in all four data

// sets (as that was the last spectrum range specified). As a result,

// only channels 80-100 will be ignored for spectra 1 and 2.

// No change will occur for spectra 3 and 4, as they have no

// channels greater than 50.

XSPEC12> ign 4:1-20 3:30-40 45–**

//Channels 11-20 for spectrum 4 are ignored (1-10 were ignored already)

// while channels 30-40 and 45-50 of spectrum 3 are ignored.

XSPEC12> ignore 1:1-5

//No channels are ignored, as these were ignored at the beginning.

XSPEC12> ignore 2:1.-5.

//Ignore all channels between 1 and 5 keV in the second dataset


next up previous contents
Next: notice Up: Data Commands Previous: fakeit