Figure 1. Wavelet
transform power spectrum for the TB, BB and BR for one of the sequence
of strikes without impact. A colour scale gives the power (V2) of the
periods; intensity increases from dark blue to dark red. The thick contour
on the spectra encloses significant regions ( =0.05). Global Wavelet
Spectrum (GWS) is the graph of power versus period for the whole duration
of the strike analysed. Peaks above the dashed line in the GWS graphs
are significant ( = 0.05).
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