For bar type plots, the data is the length of the bar, and the choice between column or bar type determines the orientation.
对于条形图，数据是条的长度，柱形图和条形图之间的选择决定条的方向。
2
The advantage is that simple device, easy adjustment and only revolving the column lens that can fabric various linear-defect in photonic lattices, they have different orientation relative toc-axis.