fortran-column-ruler-fixed

fortran-column-ruler-fixed is a variable defined in `fortran.el'.
Its value is

"0   4 6  10        20        30        40        50        60        70\n[   ]|{   |    |    |    |    |    |    |    |    |    |    |    |    |}\n"

• This variable is safe as a file local variable if its value
  satisfies the predicate `stringp'.

Documentation:
String displayed above current line by M-x fortran-column-ruler.
This variable is used in fixed format mode.
See the variable `fortran-column-ruler-tab' for TAB format mode.

You can customize this variable.