Usage

sky file [box=]

DESCRIPTION This routine computes the "sky" level under the assumption that sky is simply the most common pixel intensity (i.e. the mode). The routine calculates the histogram of the source_file in the command line determines the adu value at which the histogram is a maximum (the mode). No interpolation or fitting is done to determine a maximum than the nearest integer value. It prints out a line like.

sky=122.0