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SKY/ROMAFOT frame [sky_tab] [area] [nrx,nry]

This command divides the frame into N smaller rectangular areas, with $N=nrx\times nry$. It computes the intensity histogram in each region and determines the sky values of the areas by means of the mode of the distribution. After having found the sky value of the individual regions one can do the actual search for objects above a certain threshold.

Petra Nass