#### SpacingSpanner

SpacingSpanner objects are created by: Spacing_engraver

Standard settings:

`spacing-procedure` (procedure):
  `Spacing_spanner::set_springs`

  Procedure for calculating spacing parameters. The routine is called after `before-line-breaking-callback`.

`grace-space-factor` (number):
  `0.6`

  Space grace notes at this fraction of the `spacing-increment`.

`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.

`base-shortest-duration` (moment):
  `'#<Mom 1/8>`

  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.

This object supports the following interfaces: spanner-interface, spacing-spanner-interface, spacing-interface and grob-interface

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