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Multi-dish continuum OK, but no fringes at all on XAFF

- Could be the delay: check with CLIC whether fringes appear on the spectral correlator.
- Check phase rotator ``flashing'' lights.
- Check correlator power supplies.
- If problem persists, reset the PHASER micro.
- If problem persists, reset the correlator MASTER and SATELLITES micros.

Gildas manager 2018-12-13