circ_plot()
circ_par_init()
ring_set(1)
circ_rect(0,0,.2,1, col="#FF000030")
ring_set(2)
circ_rect(1,0,.2,1, col="#FF000030")
# rectangles are drawn using increasing values by default.
ring_set(3)
circ_rect(1,0,.2,1, increasing=FALSE, col="#FF000030")
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