*** Paper size, paper orientation, columns
The variable `ps-paper-type' determines the size of paper ps-print formats for; it should contain one of the symbols: `a4' `a3' `letter' `legal' `letter-small' `tabloid' `ledger' `statement' `executive' `a4small' `b4' `b5' It defaults to `letter'. If you need other sizes, see the variable `ps-page-dimensions-database'.

The variable `ps-landscape-mode' determines the orientation of the printing on the page. nil, the default, means "portrait" mode, non-nil means "landscape" mode.

The variable `ps-number-of-columns' must be a positive integer. It determines the number of columns both in landscape and portrait mode. It defaults to 1.