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Left: Subdivision of an ellipse (pink) based on equal radial angles (dashed black lines) leads to inaccurate boundary interpolation (blue). Center: A more accurate subdivision (solid black lines) based on equal lengths of interpolating segments. Right: Euclidean projection (q) from a point (p) on the ellipse (green) onto the boundary of the embryo (red) is more accurate than a projection along a radial line (r).
