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Add a circle to a plot, with cross-hairs
pcirc(gcol = "black", border = "black", ndiv = 36)
color of crosshairs
border color
number of divisions for the circle
no return values, used for side effects
# NOT RUN { plot(c(-1,1),c(-1,1)) pcirc(gcol = "black", border = "black", ndiv = 36) # }
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