#### VerticalAlignment

VerticalAlignment objects are created by: Vertical_align_engraver

Standard settings:

`axes` (list):
  `'(1)`

  list of axis numbers. In the case of alignment grobs, this should contain only one number.

`Y-extent-callback` (procedure):
  `Axis_group_interface::group_extent_callback`

  see `X-extent-callback`.

`X-extent-callback` (procedure):
  `Axis_group_interface::group_extent_callback`

  Procedure that calculates the extent of this object. If this value is set to `#f`, the object is empty in the X direction. The procedure takes a grob and axis argument, and returns a number-pair.

`stacking-dir` (direction):
  `-1`

  Stack objects in which direction?

This object supports the following interfaces: spanner-interface, axis-group-interface, align-interface and grob-interface

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