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Fig. 3


Illustration of the effect on the θ angle due a tilt δΩ along thelongitude of the node. The darker plane corresponds to the propagation plane before the tilt while the lighter one is the same plane after the tilt. From that sketch, we infer the relation (θ + δθ)cosδι + δΩ cos ι = θ, which reduces to δθ = −δΩ cos ι for infinitesimal tilts.

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