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Figure 3

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Amplitude of the semidiurnal variation of TEC as function of the Moon phase. New Moon is at lunar day 0, Full Moon is at lunar day 14.7653 days. The lunar cycle ends at lunar day 29.5306. The thick black line shows the dependence on the Moon phase for all TEC data in Southern China from 1998 to 2024. The colored lines show the results for the different seasons.

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