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Fig. 2.

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Schematic of the 3D geometry for the PSR J1933−6211 binary in the observer’s convention. The orbital plane is defined by the unit vectors i and j, with the orbital angular momentum perpendicular to the plane, along the direction of k. The spin of the pulsar S is assumed to be aligned with the orbital angular momentum. The plane of the sky is defined by the east and north unit vectors, with n being the unit vector of our line of sight that is defined from the pulsar to the observer. The angle between n and k by definition is the orbital inclination angle, i. In the observer’s convention, this is equal to the polar angle of the pulsar ζ. The projection of S on the sky plane forms. The angle between north and i is the longitude of the ascending node. ρ denotes the opening angle of the emission cone, with β the impact angle of n on the cone, as measured from the magnetic axis μ. αp is the inclination of μ with respect to S.

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