Column Numbers in emacs in F90 Environment?

[qquito]

Hello, Everyone:

I use emacs to do most of my editing work.

When I edit Fortran 77 codes in emacs, I can use the command Control-C
and Control-R sequentially to display a ruler temporarily showing
column numbers. But this command does not work when I edit Fortran 90
codes. Is there a similar command in Fortran 90 environment?

Thanks for reading and replying.

--Roland