/sys$common/syshlp/helplib.hlb FORTRAN, /SHOW, DATA_DEPENDENCES  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Controls whether the listing file includes diagnostics about loops
  that are ineligible for dependence analysis, and loops that inhibit
  vectorization or autodecomposition.

  The DEC Language Sensitive Editor must be used to view the
  dependence diagnostic information.  See your performance guide for
  additional information.