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![OVERVIEW OF OUTDOOR SOUND PROPAGATION · 17 in Ref. [1]). Sound prediction models, used for evaluating refraction in sound propagation include the FFP, (Fast Field Program) and PE](https://static.fdocuments.net/doc/165x107/60db345bb0af5c0a6b41ce96/overview-of-outdoor-sound-17-in-ref-1-sound-prediction-models-used-for-evaluating.jpg)
