### 3.1.101 SpacingSpanner

SpacingSpanner objects are created by: Spacing_engraver.

Standard settings:

> `average-spacing-wishes` (boolean):

>   `#t`

>   If set, the spacing wishes are averaged over staves.

> `base-shortest-duration` (moment):

>   `#<Mom 3/16>`

>   Spacing is based on the shortest notes in a piece. Normally, pieces are spaced as if notes at least as short as this are present.

> `common-shortest-duration` (moment):

>   `ly:spacing-spanner::calc-common-shortest-duration`

>   The most common shortest note length. This is used in spacing. Enlarging this sets the score tighter.

> `shortest-duration-space` (dimension, in staff space):

>   `2.0`

>   Start with this much space for the shortest duration. This is expressed in `spacing-increment` as unit. See also spacing-spanner-interface.

> `spacing-increment` (number):

>   `1.2`

>   Add this much space for a doubled duration. Typically, the width of a note head. See also spacing-spanner-interface.

> `springs-and-rods` (boolean):

>   `ly:spacing-spanner::set-springs`

>   Dummy variable for triggering spacing routines.

This object supports the following interface(s): grob-interface, spacing-options-interface, spacing-spanner-interface and spanner-interface.

#### Internals Reference v2.18.2 (稳定分支).