+MAKE_DOCUMENTED_SCHEME_CALLBACK (Separation_item, print, 1,
+ "Optional stencil for @code{PaperColumn} or"
+ "@code{NonMusicalPaperColumn}.\n"
+ "Draws the @code{horizontal-skylines} of each"
+ " @code{PaperColumn}, showing the shapes used"
+ " to determine the minimum distances between"
+ " @code{PaperColumns} at the note-spacing step,"
+ " before staves have been spaced (vertically)"
+ " on the page.")