You may now want to rebin your object frame to constant wavelength steps with
REBIN/MOS
For this you have to provide start, end, and step of the wavelength range you
want to rebin with
SET/MOS rebstrt=start, rebend=end, rebstp=step.
REBIN/MOS
The interpolation between pixels along the x-axis
is taken from 
( LINEAR)
and the order of interpolation along the y-axis between scanned rows
is read from 
If you do not provide a name for the rebinned object in 
or on the command line it will be constructed
by adding 'r' to 
.