Definitions of categories of directions (dir) and sectors around a focus bee.
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资源简介：
αNh±22.5°, the sector of neighbourhood with αNh as its central direction; αTRIG−22.5°tb TRIG+22.5°, the angular range where the triggering bee is located, synonymous to the trigger angle; αWAV, the angle from where the wave is spreading.
创建时间：
2015-12-02
