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splitCircle(x, y, radius, splitAngle = pi/4, nv = 100, border = NA, col1 = NA, col2 = NA, lty = 1, lwd = 1)
plot(-1, -1, xlim = c(0, 1), ylim = c(0,1), type = "n") splitCircle(x = 0.5, y = 0.5, radius = 0.48, splitAngle = pi/4, nv = 1000, border = NA, col1 = "blue", col2 = "red")
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