An observation shows multiple images Ω and Ω′ of the source plane region S. The image map ϕ:Ω → Ω′ connects those points θ ∈ Ω and θ′ ∈ Ω′ that show the same point in the source plane, and can be used to relate the source position mappings β′ and β = β′°ϕ.
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