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Дата изменения: Tue Feb 10 20:06:10 1998 Дата индексирования: Sat Dec 22 18:49:19 2007 Кодировка: Поисковые слова: http www.stsci.edu science goods |
Note that the neutral density filter effects have not been removed from the SV and the non-SV epoch flatfields; to avoid the problem, use a flatfield close in wavelength that was not generated with the F122M filter or use a -closure or a high fidelity flat2. For further suggestions on improving the flatfields, see "Data Accuracies and Problem Solving" on page 46-13 (see also OV/SV Report, Faber et al., 1992, Chapter 6, and Closure Flatfield Memo on WWW).
2 Note that the use of a different flat will affect the photometric calibration.
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