Why sh-set-shell insert a space after #!

[Leo]

Hello all,

If you M-x sh-set-shell in a buffer it inserts something like:

  #! /bin/bash

I am curious why a space after #!. I read this page:
http://en.wikipedia.org/wiki/Shebang_(Unix). The newsgroup post by
Dennis Ritchie also has a space. But most scripts I have seen do not. So
I am curious ;)

Leo