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 **:1-10 ! The first 10 channels of all 4 data sets are
noticed.
XSPEC> notice 80-** ! An attempt will be made to notice channels
>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.