Setting the table separator in psql command mode

Mehrdad Ghassempoory <ghassempoory@cardiff.ac.uk>

From: Mehrdad Ghassempoory <ghassempoory@cardiff.ac.uk>
To: pgsql-general@postgresql.org
Date: 1998-06-09T12:59:09Z
Lists: pgsql-general
I am trying to set up the table separator (Default "|") to TAB
caharcter.

I have tried :

\f\t
\f \t
\f '\t'

Without any luck.
How is it done?