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Mounting the Cross-disperser

The cross-disperser is mounted next to the folding prism; it will have been done by the SA following this procedure:

• Remove the lid at the bottom of the IDS.
• One of the three mounting screws has been marked A, hold it in front of the corresponding hole and then rotate the unit 120 counterclockwise.
• Insert the unit and rotate 120 back.
• Fasten screws and put lid back.
• Keep calm. It might take 1/2 an hour to do it the first time.