VMS Help FORTRAN, /SHOW, NONE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Requests that no optionally listed source lines or a symbol map be
  included in the listing file.  This is the same as specifying
  /NOSHOW.

  The default for the /SHOW qualifier is /SHOW=(NODATA_DEPEND,
  NODICT, NOINCLU, NOLOOP, MAP, NOPREPROCESS, SINGLE).