Examples:

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

XSPEC> ignore **:1-10            ! The first 10 channels of all 4 data sets are
                                   ignored.

XSPEC> ignore 80-**              ! An attempt will be made to ignore channels
                                   80 in all four data sets (as that was
                                   the last data set range specified).
                                   As a result,only channels 80-100
                                   will be ignored for data sets 1 and 2.
                                   No change will occur for data sets 3 and 4, as
                                   they have no channels greater than 50.

XSPEC> ign 4:1-20 3:30-40 45-** ! Channels 11-20 for data set 4 are ignored
                                  (1-10 were ignored already) while channels
                                  30-40 and 45-50 of data set 3 are ignored.

XSPEC> ignore 1:1-5             ! No channels are ignored, as these were
                                  ignored at the beginning.

XSPEC> ign 2:1.-5.              ! Ignore all channels between 1 and 5 keV 
                                  in the second dataset.