| 6.4.2.2. | The beam shall produce on this aiming screen, over a width of not less than 5.0 degrees on both sides of the line v, a symmetrical and substantially horizontal cut-off to enable visual vertical adjustment. In the case that visual aim leads to problems or ambiguous positions, the measurement of the cut-off quality and the instrumental method as specified in paragraphs 4. and 5. of Annex 9 shall be applied. | a0c0 |