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Fig. 3


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Scatter plots of the observed minus fitted foF2, ΔfoF2, versus <ap>24 h at Petropavlovsk in (a–d) four seasons; the red dots and error bars are mean values and corresponding lower and upper quartiles of gridded ΔfoF2, respectively. The parameter r is the correlation coefficient between ΔfoF2 and <ap>24 h, and the number in the parentheses is the corresponding P-value indicating statistical significance of the correlation coefficient.

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