Specifies the length of the left and right guides starting at the baseline (line distance = 0). Positive values extend the guides above the baseline and negative values extend the guides below the baseline.
指定从基准线处（线间隔 = 0）开始计算的左辅助线和右辅助线的长度。输入正值将在基准线之上延伸辅助线；输入负值将在基准线之下延伸辅助线。