Probability distribution function, 𝒫, of the distance D to 1FGL J1018.6–5856 derived from the Gaia DR2 parallax by assuming a prior 𝒫prior(D) = D2exp(−D/L) (see text for more details). The blue vertical line represents the mean distance to the source and the light blue shadowed region represents its ±1σ confidence interval (). The red vertical line represents the median distance (6.8 kpc).
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