#### system-start-delimiter-interface

The brace, bracket or bar in front of the system. It is implemented as a spanner.

##### User settable properties:

`arch-angle` (number)
  Turning angle of the hook of a system brace
`arch-height` (dimension, in staff space)
  Height of the hook of a system brace.
`arch-thick` (number)
  Thickness of the hook of system brace.
`arch-width` (dimension, in staff space)
  Width of the hook of a system brace.
`bracket-thick` (number)
  width of a system start bracket.
`collapse-height` (dimension, in staff space)
  Minimum height of system start delimiter. If equal or smaller, the bracket is removed.
`glyph` (string)
  a string determining what (style) of glyph is typeset. Valid choices depend on the function that is reading this property.
`thickness` (number)
  Bar line thickness, measured in `linethickness`.

This grob interface is used in the following graphical objects: SystemStartBar, SystemStartBrace and SystemStartBracket

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