Section 12,1: Standard

 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)