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Point spread
The correction factor for source photons which lie outside the source
box used is energy dependent. An array of corrections, one for each of
the 729 trial energies, is calculated and used to produce the full
energy dependent correction array stored in the datafile as:
MORE.ASTERIX.INSTRUMENT.ENCORR(1).DATA_ARRAY
NB: The point spread function is only defined for a circular box.
It can be used reasonable accurately with an elliptical or rectangular
box, but NOT with an annulus. When files containing an annular source
box are corrected, point spread corrections are turned off.
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