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Figure 7


Fig. 7. Continuous wavelet transforms (2D-contour maps) calculated using Eqn 5 from pressure gradient excitation profiles [f(s), red curves below each contour map] associated with one (A,B) or two (C,D) dipole sources. The column to the right of each contour map quantifies the contour colours. Pressure gradient profiles were obtained using a single wavelet function defined by Eqn 2c. For the case of two sources (C,D), the pressure gradient was determined as the sum of two individual wavelet functions. The white crosses in the contour maps indicate the positions of the dipole sources in x,y-space and correlate adequately with the maxima of the contour plots in b,d-space (A–C). If the sources are aligned with a fixed y-coordinate (D), the maxima seem to attract each other.





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