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Fig. 12

image

Left: time-distance diagram computed from Eq. (87)at the height of the Dirac source. Right: observational time-distance diagram computed from the Fourier transform of the SOHO/MDI/Doppler medium-degree power spectrum (Kosovichev et al. 1997). The SOHO/MDI time-distance diagram fades away at large separation distances due to foreshortening.

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