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User name Solvignon
Log entry time 13:20:22 on January14,2003
Entry number 91812
keyword=target at 180deg: half-wave plates at the bad angles
Xiaochao just checked the alignment and saw that
all half-wave plates were off by 45deg.
So we rotated all to the good angle.
That means that we didn't have masing but the optics
alignment at 180deg was depolarizing the cell.