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Fig. E.1.
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Geometry of the line of sight integration problem. For each point (x′,y′) in the plane of the sky, the 3D density disk distribution ρd(x, y, z) must be integrated along a line of constant R′ = (x′2 + y′2)1/2. The angle θ is oriented such that it is positive for z′> 0 and negative otherwise.
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