GNU Emacs Manual - Fortran Misc

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### Other Fortran Mode Commands

`C-x n d`
  Narrow to the current Fortran subprogram.

Fortran mode redefines the key `C-x n d` to run the command `fortran-narrow-to-subprogram`, which is the Fortran analogue of the key's usual definition. It narrows the buffer to the subprogram containing point.

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