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Our method in a nutshell
Salvato, Buchner, Budavári et al. 2017
Hypothesis 1: chance alignment of unrelated srcs
Hypothesis 2: single source
Bayes 
factor
Angular separation
Positional uncertainties
Weighting term
(mag, colors,etc)
The posterior probability for a match 
between an X-ray source, i,
and a potential counterpart j
depends on
counterpart sky number density ρs
and expected counterpart fraction ηx