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Illustration of derivation of DOSKA: The goal is to obtain a prediction of l at η* = [β*, ζ*] ( x) using the set ℬ of β knots (△). Top: the knots 𝒟 (○) are selected to cover the elliptical HPD region. {η*} ∪ 𝒟 is projected onto the ζ -space to produce 𝒵* (▹ and *). Bottom: ℬ ⊕ 𝒵* is marked by large and small +; ℬ ⊕ ζ* is marked by large +. The online version of this figure is in color.
