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The procedure is similar to the flat field combining
procedure, except that you may want to scale the sky level using the
mean, median or the mode of the intensity distribution or taking into
accoun the 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 
for the keywords.
Table: Keywords for combining sky calibration frames