#### SystemStartBracket

SystemStartBracket objects are created by: System_start_delimiter_engraver

Standard settings:

`Y-extent-callback` (procedure):
  `#f`

  see `X-extent-callback`.

`print-function` (procedure):
  `System_start_delimiter::print`

  Function taking grob as argument, returning a `Stencil` object.

`glyph` (string):
  `bracket`

  a string determining what (style) of glyph is typeset. Valid choices depend on the function that is reading this property.

`arch-height` (dimension, in staff space):
  `1.5`

  Height of the hook of a system brace.

`arch-angle` (number):
  `50.0`

  Turning angle of the hook of a system brace

`arch-thick` (number):
  `0.25`

  Thickness of the hook of system brace.

`arch-width` (dimension, in staff space):
  `1.5`

  Width of the hook of a system brace.

`collapse-height` (dimension, in staff space):
  `1`

  Minimum height of system start delimiter. If equal or smaller, the bracket is removed.

`thickness` (number):
  `0.25`

  Bar line thickness, measured in `linethickness`.

This object supports the following interfaces: spanner-interface, system-start-delimiter-interface and grob-interface

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