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Low-frequency spectro-spatial flat-field (application)

-in none Input continuum datacube
-out none Output flat-field datacube
-N 10 Number of central lenses used for normalization
-smooth 1 Smoothing parameter (>0: spline, 0: polynom-fit)
-lens null Debug lens
-sky null Input sky (twilight) datacube
-frac 0.8 Central fraction of the spectrum used in mean normalization
-radius 10 Radius of the spectral median filter
-twilight Twilight flag (requires -sky option)
-reflens 113 Reference lens in twilight cube
-deg_sky 15
Error status
For a spline, the smoothing parameter is suggested in the range [1+-sqrt(2/N)] where N is the number of points.

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