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Fig. 1. Example lidar slice of a horizontal plume. The rectangle represents the field being worked and the large arrow indicates the tractor path. The dotted line indicates the plume axis direction and the average wind direction. The source point is at the intersection of the plume maximum line and the tractor path (indicated by the arrow moving left to right); in this example, that is also the point of maximum backscatter (Bm). Be is the edge backscatter and 
Y is the plume width as needed for application of Eq. [1].
