LilyPond Contributor's Guide: 10.7.5 Debugging skylines

### 10.7.5 Debugging skylines

To show the skylines used for spacing, use

>     \override SomeGrob.show-horizontal-skylines = ##t

or

>     \override SomeGrob.show-vertical-skylines = ##t

The option `debug-skylines` is equivalent to setting `show-vertical-skylines` on VerticalAxisGroup and System.

Another particularly useful application is showing the skylines used for note spacing:

>     \layout {
>       \context {
>         \Score
>         \override PaperColumn.show-horizontal-skylines = ##t
>         \override NonMusicalPaperColumn.show-horizontal-skylines = ##t
>       }
>     }

This is also an occasion to test if the pure estimates used to build them are reasonably accurate.

#### LilyPond — Contributor’s Guide v2.24.4 (stable-branch).