ps-header-line-pad

ps-header-line-pad is a variable defined in `ps-print.el'.
Its value is

0.15

Documentation:
Portion of a header title line height to insert.
The insertion is done between the header frame and the text it contains,
both in the vertical and horizontal directions.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 20 of Emacs.