Fig. A.1.

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Dependence on the inclination angle, α, of the theoretical expression for , given by Eq. (A.13), for θP → θPS, σ21 → 0, and τ → τ2min → τ2max, shown by the red points. The theoretical value of
ranges from infinity to zero over the interval 0 < α ≤ π/2. The horizontal dashed line (in blue) shows the value of
, given by Eq. (A.12), for the parameters of the Crab Pulsar derived from observations. As indicated by the vertical dashed line (in blue), these two values of
match for an α = 1.32 radian (i.e. α = 75.5°).
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