Whether the median is to be used when calculating the behaviour of the flat field using only local pixels.
Set TRUE if the median value is to be used.
This applies only when TUNE_FFNXPLY=1 (no polynomial model), in which case the local median or mean is taken over the nearest TUNE_FFLSMP pixels. This is useful for cases where there is significant small-scale structure in the flat field.
INTIIAL SUGGESTED VALUE: FALSE.
Martin Clayton