Fig. 4.
Power spectral densities (PSDs) obtained from the residual data (f ⩽ 1·5) for the different age groups: (a) 0–9, (b) 10–19, (c) 20–29, (d) 30–39, (e) 40–49, (f) 50–59, (g) 60–69, (h) 70–79, and (i) ⩾80 years.
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