Figure 3.

Schematic representations of the PSR B1957+20 system, to scale, projected on the plane of the sky for inclinations 55°–85° (columns), q = 69.2, and orbital phase 0.034 from SC at eclipse ingress/egress. Rows of insets indicate several fixed θ_max,R, the same values as those in Figure 2, with R₀ chosen such that f_E ≈ 7%. The spherical companion is illustrated for size R_* = 0.9R_vL ≈ 0.1 with the blue dot representing the pulsar. Panels where R₀ < R_* is obligatory are omitted. For all panels, the color coding emphasizes, schematically, the locales of first-order Doppler boosting. A velocity profile of v_s ∝ θ tangent to the shock is imposed; the blue or red coloring accentuate those regions of the shock where the v_s along the shock is toward or away the observer line-of-sight, respectively, with intensity of coloring scaled with projected velocity component magnitude from Eq. (25). This coloring qualitatively demonstrates the geometrical contribution to the emissivity integral in §4 that culminates in DP light curves.