Fig. 1
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S-index (SMWO) vs time. Monthly averaged values are plotted as green circles, where the dispersion is shown as error bars. The dotted vertical line separates the SMWO from this work (to the right of the vertical line) and Boro Saikia et al. (2018b) (to the left of the vertical line). The best fit cycle periods (22.3 and 5.7 yr) from Boro Saikia et al. (2018b) are shown in blue.
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