2. If the beam off-axis distance is not indicated in the figure, the beam center line coincides with the axis or the beam edge line coincides with the axis.
2. If the distance of the beam bias is not indicated in the figure, the center line of the beam is re-matched with the axis or the edge of the beam is re-matched with the axis,
2. If the off-axis distance of the beam is not indicated in the drawing, the center line of the beam coincides with the axis or the side line of the beam coincides with the axis,<br>