VMS Help FORTRAN, Source Format, Standard  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  A Fortran line is divided into fields for the required information.
  Each column represents a single character.

   COLUMN    FIELD
   ------    -----
       1     Indicator: Comment(C,c,*,!,blank) or Debug(D,d)
     1-5     Label (any decimal integer except zero)
       6     Indicator: Continuation of statement (any character
                   except zero or space)
    7-72     Statement Field (up to column 72)
   73-80     Sequence Number (optionally to column 132 -- ignored)