XSPEC> recornrm ** ! All the files' correction norms are adjusted
by a single number.
XSPEC> recornrm 1-3 5 ! Files 1,2,3, and 5 are adjusted.
XSPEC> recornrm ! File 5 (the last range input) is adjusted
by itself.
XSPEC> recornrm 2 ! File 2 is adjusted