/usr/lib/iraf/extern/rvsao/velset.par is in iraf-rvsao 2.8.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | # Parameters for SETVEL task of IRAF package RVSAO 2.3
input,s,a,"",,,Input spectra
newvel,r,a,0.,,,New redshift in km/sec or Z
output,s,a,"",,,Output spectra or directory
velz,b,h,no,,,New redshift in Z instead of km/sec (yes or no)
shift,b,h,yes,,,Shift(yes) or set(no) wavelengths by newvel
verbose,b,h,yes,,,Print operations ?
mode,s,h,ql
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