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FORS1: Sky Flats and Rotator Effect |
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Median Twilight Image (all frames normalized by their median before averaging and corrected for 4-port structure) |
Median of Normalized Twilight Images at Rotator Angle 0 | Median of Normalized Twilight Images at Random Rotator Angle | Time Frame and Rotator Angle Distribution |
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B_UT2: 331 frames June 2004 - December 2005 |
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U_UT2: 275 frames June 2004 - December 2005 |
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B_UT1_C: 279 frames December 2002 - March 2004 |
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U_UT1_C: 233 frames December 2002 - March 2004 |
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B_UT3: 328 frames September 2001 - September 2002 |
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U_UT3: 292 frames September 2001 - September 2002 |
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B_UT1_B: 203 frames August 2000 - February 2001 |
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U_UT1_B: 200 frames August 2000 - February 2001 |
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B_UT1_A: 253 frames April 1999 - September 1999 |
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U_UT1_A: 172 frames April 1999 - September 1999 |
