#### spacing-spanner-interface

The space taken by a note is dependent on its duration. Doubling a duration adds spacing-increment to the space. The most common shortest note gets `shortest-duration-space`. Notes that are even shorter are spaced proportonial to their duration.

Typically, the increment is the width of a black note head. In a piece with lots of 8th notes, and some 16th notes, the eighth note gets 2 note heads width (i.e. the space following a note is 1 note head width) A 16th note is followed by 0.5 note head width. The quarter note is followed by 3 NHW, the half by 4 NHW, etc.

##### User settable properties:

`base-shortest-duration` (moment)
  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)
  The most common shortest note length. This is used in spacing. Enlarging this will set the score tighter.
`grace-space-factor` (number)
  Space grace notes at this fraction of the `spacing-increment`.
`shortest-duration-space` (dimension, in staff space)
  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)
  Add this much space for a doubled duration. Typically, the width of a note head. See also spacing-spanner-interface.

This grob interface is used in the following graphical objects: SpacingSpanner

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