Linking from the NR to the Axis_group_engraver IR entry
directs the reader to the list of staff contexts and
`non-staff line' contexts.
@emph{Non-staff lines} (such as @code{Lyrics}, @code{ChordNames},
etc.) are contexts whose layout objects are engraved like staves
(i.e. in horizontal lines within systems). Specifically,
@emph{Non-staff lines} (such as @code{Lyrics}, @code{ChordNames},
etc.) are contexts whose layout objects are engraved like staves
(i.e. in horizontal lines within systems). Specifically,
-non-staff lines are non-staff contexts that create the
-@code{VerticalAxisGroup} layout object.
+non-staff lines are non-staff contexts that contain the
+@rinternals{Axis_group_engraver}.
The following properties affect the spacing of non-staff lines:
The following properties affect the spacing of non-staff lines: