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(a) S 4 time profile over San Miguel de Tucumán during March 2011. (b) Relative energy of each intrinsic mode component of the S 4 index as a function of the period (in days); colors indicate three different intervals of periods: low periods (yellow), middle periods (red) and high periods (green). (c–e) Report the time profiles of the sum of the S 4 intrinsic mode components of the low (S 4L), middle (S 4M) and high (S 4H) periods, respectively.
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