plot图像编辑程序，绘制plot图之后，常需要进行局部放大的操作，magnify文件大显身手的时候就到了，具体操作不做赘述，请见百度(Plot image editing program, drawing plot diagram, often need to do some local zoom operation, magnify files to show their talents when, the specific operations do not go into details, please see Baidu)