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Estimated age-specific depth contours (cuts) in Example 2 for [left panel] head circumference (y2) and weight (y1), and [right panel] head circumference (y2) and length (y1), at equispaced ages t0 = 0 (birth; black), 1.75 (blue), 3.5 (green), 5.25 (cyan) and 7 (yellow) years. Observations are shown by dots (darker for younger subjects, lighter for older ones).
