The radar coordinate system is a modification of polar coordinate system, commonly used for radar chart
1  | coord_radar(theta = "x", start = 0, direction = 1)
 | 
theta | 
 variable to map angle to (x or y)  | 
start | 
 offset of starting point from 12 o'clock in radians  | 
direction | 
 1, clockwise; -1, counterclockwise  | 
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