Fig. 1

Two-dimensional distributions of S/N as a function of cosι, sinβ, λ, and ψ. Face-on, mildly face-on, mildly edge-on, and edge-on systems (whose exact bounds are specified in Sect. 2) can be read off from the top-left panel. In the other panels, the trend from face-on to edge-on systems follows from the top of the distribution to the bottom.
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