Assume that 4 data sets have been read in, the first 2 having 100 channels and the last 2 having 50 channels. Assume also that channels 1-10 of all four data sets are ignored and that channels 80-100 of data sets 1 and 2 are ignored.
| XSPEC> notice 1-4:1-10 | | The first 10 channels of all 4 data sets are noticed. |
XSPEC> notice 80-  | | An attempt will be made to notice channels
 80 in all 4 data sets (as that was
the last data set range specified) but
the result is that only channels 80-100
will be noticed for data sets 1 and 2,
with no change for data sets 3 and 4 as
they have no channels greater than 50. |
| XSPEC> notice 1:1-5 | | No channels are noticed, as these channels were noticed in the beginning. |