#### stem-tremolo-interface

A beam slashing a stem to indicate a tremolo.

##### User settable properties:

`beam-thickness` (dimension, in staff space)
  thickness, measured in staffspace.
`beam-width` (dimension, in staff space)
  width of the tremolo sign.
`flag-count` (number)
  The number of tremolo beams.

##### Internal properties:

`stem` (layout object)
  pointer to Stem object.

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

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