#### DotColumn

DotColumn objects are created by: Dot_column_engraver

Standard settings:

`axes` (list):
  `'(0)`

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

`direction` (direction):
  `1`

  Up or down, left or right?

`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.

`X-offset-callbacks` (list):
  `'(#<primitive-procedure Dot_column::side_position>)`

  A list of functions determining this objects' position relative to its parent. The last one in the list is called first. The functions take a grob and axis argument.

This object supports the following interfaces: item-interface, axis-group-interface, dot-column-interface and grob-interface

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