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Fig. 1. A schematic view of the visual arena. The arena had a circumference of 160
rows and a height of 24 rows of LEDs with 24 columns removed at the up- and
downwind ends to allow smooth airflow over the fly. Flies were glued to a
steel pin, positioned between two magnets, allowing rotation around the
functional yaw axis. A camera positioned below the tunnel visualized the fly
at 100 Hz through a hole in the center of a set of ring magnets.