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Algorithm
The following criterion is used to decide whether two sources
are the same.
great_circle < max( MINSEP, RMULT*(err1+err2) )
where 'great_circle' is the angular separation of the sources,
MINSEP is the estimate of the systematic error in the posi-
tions of the sources, RMULT is a multiplicative fudge factor,
and err are the positional errors of the sources.
If two sources satisfy this criterion, then one of them is
chosen for the output catalogue ( the other may be output
to a rejects catalogue if that option is selected ).
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