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Represent- ed in the Greulich and Pyle atlas are 'central tendencies', which are modal levels of maturity within chronological age groups. The skeletal age as-. Through radiographs, this process provides a valuable criterion for estimating nor- mal and abnormal growth and maturation (Fig. 2.2). Greulich and Pyle andRADIOGRAPHIC. ATLAS OF. SKELETAL. DEVELOPMENT. OF THE HAND. AND WRIST. William Walter Greulich. &. S. Idell Pyle. MALE. STANDARDS. FEMALE. STANDARDS