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. 2015 Oct 29;5:15689. doi: 10.1038/srep15689

Figure 3. The predicted summary wave (the sum of two principal components) calculated from 1200 to 3200 years from the ‘historical’ period (cycles 21–23) marked with a black oval.

Figure 3

The historical maxima and minima of the solar activity in the past are marked by the horizontal brackets.