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Table 1

ESO VLT FORS2 instrument offset during different observation periods.

Epoch Observed STD Θmeasured   (°) Θreal   (°) Θ0   (°)

2009-04-04 Hiltner 652 91.9 179.5 –87.6
2010-02-22 Ve 6-23 158.2 172.5 –14.3
2010-05-04 Ve 6-23 175.0 172.5 +2.5

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