public List<GridPoint> getArticulations(E edge) {
		List<GridPoint> list = edgePoints.get(edge);
		if (list == null) {
			return Collections.emptyList();
		}
		return list;
	}
Returns the column of the initial vertex in this grid.
@return the column of the initial vertex in this grid
Ghidra/Framework/Graph/src/main/java/ghidra/graph/viewer/layout/GridLocationMap.java