Fig. 6.

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Illustration of the reflection effect asymmetry induced by (highly exaggerated) relativistic beaming (solid green line). The reflection effect would be symmetric in the absence of beaming (dot-dashed black line), assuming a synchronized/circularized binary. The beaming effect from the sdB (dashed blue line) is sinusoidal and peaks at phase 0.25. The beaming effect from the dM/BD, whose velocity variations are π out-of-phase with those of the sdB, would be sinusoidal if the cool companion contributed non-negligible and constant flux to the system light (dotted pink line). However, the dM/BD contributes negligible light to the system outside its reflection effect, and its beaming shape is more complicated (dashed red line) since it can only manifest itself through the reflection effect. Both beaming effects, which are shown approximately four times their typical strength for improved visualization purposes, lead to an overall skewness of the observed reflection effect.
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