acts as an index for looking up a @code{Stencil} object.")
(shorten ,ly:dimension? "The amount of space that a stem is shortened.
Internally used to distribute beam shortening over stems.")
- (skyline-distance ,number? "The distance between this staff and the
-next one, as determined by a skyline algorithm.")
(stem-info ,pair? "A cache of stem parameters.")
(system-Y-offset ,number? "The Y-offset (relative to the bottom of the
top-margin of the page) of the system to which this staff belongs.")