VMS Help SET, ENTRY, Qualifiers, /SPACE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /SPACE
       /NOSPACE

    Controls whether the output of a print job is double-spaced.
    Specifying the /NOSPACE qualifier causes the output to be single-
    spaced. When you use the /SPACE qualifier with the SET ENTRY
    command, the qualifier applies to the entire job. You cannot use
    this qualifier to specify different spacing for individual files
    within a multifile job.