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Figure 1
Illustration of the optical setup under consideration, showing the different systems of coordinates used in the text. The Oτ axis is perpendicular to Oso; the Ωu axis is perpendicular to Ωq and to Osh. The shape of the caustic curve is schematically shown on the right-hand side. |


journal menu![[Figure 1]](dm5031fig1.jpg)



