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4 Background Rescaling
Background rescaling is a technique for countering bad background
models - it is available only in EXPERT mode when using the Cash
statistic. In addition to determining a best fit psf scale factor
PSS locally optmises a background scaling factor across the box in
use. This is useful if the gradient of the error of the background
model is not large on the scale of the box size.
To enable rescaling, specify EXPERT mode and RESCALE. PSS will ask
for an initial guess for the background rescaling factor to use on
each pixel - this is 1.0 by default.
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