Time series of the epidemic index and sunspot numbers. (IMAGE)

Science China Press

Time series of the epidemic index and sunspot numbers.

Caption

The time series of decadal epidemic indices (top panel), comparisons of sunspot numbers (blue lines in the bottom panel, decadal interval data) and epidemic indices (black lines in the bottom panel, decadal interval data) from AD 0 to 1840.

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©Science China Press

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