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AERMOD-predicted air concentrations of dispersant when wind speed (WS) was light and wind direction (WD) was approximately parallel (13 June, a) or perpendicular (2 July, b) to the flight path. Flight paths are shown as contiguous volume sources that appear as red lines. The axes are in units of meters in Universal Transverse Mercator (UTM) coordinates. Arrows indicate the simulated wind direction.
