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

  Gw.d[Ee] (General Floating Editing)

  On input, performs the same as F format.

  On output, transfers the value of the corresponding I/O list
  element, rounded to d decimal positions, and right-justified, to an
  external field that is "w" characters long.  The form in which the
  value is written is a function of the magnitude of the value.  as
  given below:

   Data Magnitude             Effective Conversion
   --------------             --------------------
          m < 0.1             Ew.d[Ee]
   0.1 <= m < 1.0             F(w-4).d, n(' ')
   1.0 <= m < 10.0            F(w-4).(d-1), n(' ')
        .                       .
        .                       .
        .                       .
   10**d-2 <= m < 10**d-1     F(w-4).1, n(' ')
   10**d-1 <= m < 10**d       F(w-4).0, n(' ')
         m >= 10**d           Ew.d[Ee]

  The term "w" must be large enough to include all the following:  a
  minus sign (when necessary) or a plus sign (if SP editing is in
  effect), a decimal point, one digit to the left of the decimal
  point, "d" digits to the right of the decimal, and either a
  4-character or "e"+2-character exponent.

  Therefore, "w" must be greater than or equal to "d"+8.  If "e" is
  present, "w" must be greater than or equal to "d"+"e"+6.