On Permanent Periodicity in Sunspots . 10 20 50 40 50 Final mean curves: 60 70 80 90 100 (10 120 * 130 and doubled departure from •o 20 30 40 50 60 70 80 90 100 110 Periodic components, unmodified data. 120 130 Roy. Soc. Proc, A. vol 93. iAji i A A , a . i A a A A, a *« a A

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