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Combining Sky Frames

  The procedure is almost exactly similar to the flat field combining procedure, except that you may want to scale the sky level using the mode of the intensity distribution and according exposure time. Hence, in the combining, like in the case of combining flat fields, correct weighting of the frame is important. Combining should be done filter by filter. See Table gif for the keywords.

  
Table: Keywords for combining sky calibration frames



Pascal Ballester
Tue Mar 28 16:52:29 MET DST 1995