VMS Help CMS, DIFFERENCES, /CLASS, Qualifiers, /WIDTH=n  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Specifies the limit for the width of the differences report. The
    value n is required and must be an integer in the range 48 to 511.
    If n is less than 48, 48 is used. If n is more than 511, 511 is
    used. The default width is the same as the width of the output
    device.

    The width of the report is rounded down to the nearest multiple
    of 8 minus 1. CMS rounds down so that if you have specified the
    /PARALLEL qualifier, CMS correctly interprets the horizontal tabs
    in the generation comment on the right. Thus, for example, if you
    specify a value of 100 on the /WIDTH qualifier, the actual width
    is 95.