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6.3.9 Adjusting M3
(1) Attach the cell jig.
(2) Adjust the rotation and elevation angle of the M3 assembly so the 0-order
light image hits the center of the target on the cell jig.
(3) Remove the M1 jig, attach a dummy cell, and double check that the long
narrow 0-order light image is over the cell hole.
Caution: Be careful not to touch the mirror or grating surfaces with your hands.
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