circle_2d ~points ?legend ?fill () plots each triple (x, y, r) as a circle at position (x, y) with radius r. The radius is interpreted in the scale of the x axis.
circle_3d ~points ?legend ?fill () plots each tuple (x, y, z, r) as a circle at position (x, y, z) with radius r. The radius is interpreted in the scale of the x axis.