Tab

 A Fortran line is divided into fields for the required information.
 Each column represents a single character.  You cannot specify a
 sequence number field using this method of coding.

  COLUMN   FIELD
  ------   -----
  (before tab)
    1      Indicator: Comment(C,c,*,!,blank) or Debug(D,d)
  1-5      Label (any decimal integer except zero)
  (after first tab)
    6      Indicator: Continuation of statement (any digit 1-9)
  (after second tab)
           Statement Field (up to column 72)

 Tabs are treated as single characters.