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Results from the surface data on a randomly selected vertex: Observed individual trajectories of the surface location vectors and the smooth estimates of the mean function for (a) x-coordinate for male infants; (b) y-coordinate for male infants; (c) z-coordinate for male infants; (d) x-coordinate for female infants; (e) y-coordinate for female infants; and (f) z-coordinate for female infants.
