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

  nPFw.d

  On output, the value of the I/O list element is multiplied by 10**n
  before transfer to the external record.  Thus, a positive scale
  factor moves the decimal point to the right; a negative scale
  factor moves the decimal point to the left.  Thus, the F field
  descriptor alters the magnitude of the data.