Example flight patterns and illustration of variability.

<p>A. Example fruit fly trajectory in a wind tunnel containing a stationary ethanol plume. The plume outline is shown in red, with the shell indicating 2 standard deviations from the plume’s centerline. The trajectory color shows the instantaneous odor concentration experienced by the fly, and the green star marks where the fly took off. B. Example plume-crossings from several trajectories. Blue arrows on a subset of crossings indicate the direction of flight. C. Heading is defined as the angle between the upwind direction and the fly’s velocity vector. D. Heading time courses surrounding example crossings (gray), as well as mean (black solid) and standard deviation (black dashed), relative to the crossing time. E. Odor concentration time courses surrounding example crossings.