ps-line-height

ps-line-height is a compiled Lisp function in `ps-print.el'.

(ps-line-height FONT-SYM)

The height of a line, for generating PostScript.
This is the value that ps-print uses to determine the height,
y-dimension, of the lines of text it has printed, and thus affects the
point at which page-breaks are placed.
The line-height is *not* the same as the point size of the font.