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A, AQs of different-aged cohorts of coconut palms are closely correlated with the mean annual sunspot numbers 4 years before planting (r = 0.85). Area of largest circle represents 76 trees. B, Idealized version of the relationship between sunspot numbers (thick line) and AQ (thin line). Oscillations in the AQ are proposed to be coincident with oscillations in the frequency of recurrent geomagnetic storms.
