fortran-column-ruler
fortran-column-ruler is an interactive compiled Lisp function in `fortran.el
'.
(fortran-column-ruler)
Insert a column ruler momentarily above current line, till next keystroke.
The ruler is defined by the value of `fortran-column-ruler-fixed' in fixed
format mode, and `fortran-column-ruler-tab' in TAB format mode.
The next key typed is executed unless it is SPC.