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Fig. 9.
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Assumed geometry of the problem, adapted from Poutanen & Beloborodov (2006). The binary inclination i, the colatitutde of the two spots θ1 and θ2, their phases ϕ1 and ϕ2, and the angle made by the direction of the emitted photon with respect to the normal to the spot in the comoving frame α′ are explicitly indicated.
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