ps-line-spacing

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

0

Documentation:
Specify line spacing, in points, for ordinary text.

Either a float or a cons of floats (LANDSCAPE-SIZE . PORTRAIT-SIZE).

See also `ps-paragraph-spacing' and `ps-paragraph-regexp'.

To get all lines with some spacing set both `ps-line-spacing' and
`ps-paragraph-spacing' variables.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 21.1 of Emacs.