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Figure 4
A hyperboloidal surface segment (green curve) is rotated to be tangent to the xy plane at the central point of intersection (red dot). The distances to the foci are p and q and rays from the foci to the mirror center make equal angles θ.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 30| Part 3| May 2023| Pages 514-518
https://doi.org/10.1107/S1600577523001492
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