Gaia Data Release 2
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Fig. 15


Directed acyclic graph that represents a hierarchical Bayesian model of a set of N parallax measurements characterised by uncertainties σϖ and true distances drawn from an exponentially decreasing density distribution of distances (see Eq. (18)). The scale length of the exponential decrease, L, is itself a model parameter that we can infer from the sample. Its prior is defined in this case for the sake of simplicity as a Gaussian distribution of mean μL and standard deviation σL.

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