Fig. 7
From: Radar quantifies migrant concentration and Dawn reorientation at a Great Lakes shoreline
Distribution of targets by direction of flight. Zero degrees denotes north and each wedge represents 5 compass degrees. Each rose diagram represents 60,000 sample targets (20,000 from each trial A, B, and C). Over-water targets are a subset of all targets observed at the shoreline locations. Arrows point toward the circular mean target direction, and arrow length is the mean resultant length (MRL) with a full radius representing perfect alignment (MRL = 1). Diagrams were produced using R package ‘circular’ [40]