EVENTS affecting grating positions
DATE       MJD-OBS events
---------------------------------------------
2000-05-12  677.6  "5.9 mag earthquake"
2002-07-05 1460.5  "adjustment of red crossdispersers after repair"
2002-08-11 1499.5  "CD adjustment"
2002-09-28 1546.5  "adjustment of red crossdispersers after repair"
2002-10-18 1565.5  "earthquake"
2003-01-05 1644.5  "shift caused by intervention"
2003-02-04 1674.0  "resetting CD position"