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FORS2: Sky Flats and Rotator Effect |
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Median Twilight Image (all frames normalized by their median before averaging; frames before April 2002 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_UT1_2CCD: 256 frames June 2004 - December 2005 |
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U_UT1_2CCD: 264 frames June 2004 - December 2005 |
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B_UT4_2CCD: 289 frames April 2002 - October 2003 |
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U_UT4_2CCD: 199 frames April 2002 - October 2003 |
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B_UT4: 199 frames June 2001 - March 2002 |
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U_UT4: 117 frames June 2001 - November 2001 |
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B_UT2_B: 125 frames December 2000 - May 2001 |
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U_UT2_B: 88 frames December 2000 - May 2001 |
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B_UT2_A: 155 frames May 2000 - December 2000 |
