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Fig. B.1


Hierarchical tree model for a generic Gaussian field f on the sky. Itis decomposed into an amplitude field Af containing the correlation structure and an a priori white Gaussian field ξf connecting this correlation information to the actual spatial representation. Af on its own again depends on hyper-priors σf lf and another white field ζf. This tree wraps up Appendix B and is the core building block of our correlation structure inference.

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