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3.1.61 GridLine
A vertical line between staves,
indicating rhythmic synchronization.  See also
GridPoint.
GridLine objects are created by: Grid_line_span_engraver.
Standard settings:
-  layer(integer):
- 0- An integer which determines the order of printing objects. Objects with the lowest value of layer are drawn first, then objects with progressively higher values are drawn, so objects with higher values overwrite objects with lower values. By default most objects are assigned a layer value of 1. 
-  parent-alignment-X(number):
- 0- Specify on which point of the parent the object is aligned. The value - -1means aligned on parent’s left edge,- 0on center, and- 1right edge, in X direction. Other numerical values may also be specified - the unit is half the parent’s width. If unset, the value from- self-alignment-Xproperty will be used.
-  self-alignment-X(number):
- 0- Specify alignment of an object. The value - -1means left aligned,- 0centered, and- 1right-aligned in X direction. Other numerical values may also be specified - the unit is half the object width.
-  stencil(stencil):
- ly:grid-line-interface::print- The symbol to print. 
-  X-extent(pair of numbers):
- ly:grid-line-interface::width- Extent (size) in the X direction, measured in staff-space units, relative to object’s reference point. 
-  X-offset(number):
- ly:self-alignment-interface::aligned-on-x-parent- The horizontal amount that this object is moved relative to its X-parent. 
This object supports the following interface(s):
grid-line-interface, grob-interface, item-interface and self-alignment-interface.
This object is of class Item (characterized by item-interface).
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