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Discrete Fourier transform of the experimental spectroscopy triangle in Fig. 3a. The three-dimentional plot of the Fourier intensity was used to extract the intrinsic dephasing time T2 and the ensemble averaging T2* from the exponential decay (the red line in the inset is a fit, see the main text). The reciprocal-space variables kA and kε correspond to the real-space variables A and ε, respectively.
