code: function (from, to) {
  
  		var toPath = this.getPlotLinePath(to),
  			path = this.getPlotLinePath(from);
  			
  		if (path && toPath) {
  			path.push(
  				toPath[4],
  				toPath[5],
  				toPath[1],
  				toPath[2]
  			);
  		} else { // outside the axis area
  			path = null;
  		}
  		
  		return path;
  	}
docs: Create the path for a plot band