to change the values. From within IDL, simply
type
nlk_edit_grismspec at the prompt. This will pop-up the parameter
editor. All parameters are described in plain English and can be changed
(see Figure 5.3). The changes take effect immediately
after
hitting the 
button on the editor pop-up. In addition, the
values are written back to the file
$NICMOSLOOK_BASE/grismspec.dat.
See section C.1 for more details.
