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a) Energy diagram of the first 20 eigenvectors (EV) obtained from the SSA. The horizontal dashed line indicates the 1% energy limit. b) Residuals obtained by removing the signals associated with the first four EV from the original GMTA record. The black bold line represents the linear fit (not significant, p>0.05). c) Autocorrelation analysis of the residuals. The horizontal dashed lines indicate significant bounds.
