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Background Subtracted Data
ASMOOTH treats data slices which lie below zero in a special way.
These usually occur in background subtracted or patched data. The
assumption is made that the negative regions are unphysical, and
so are smoothed completely flat. The normalisation of these slices
is kept such that the flux is conserved in the total output image
- i.e. the negative flux is distributed evenly over the ASMOOTHed
dataset.
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