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Extended Data Fig. 3 | Channel-by-channel analysis of heterodyne chirp
characterization. a, Time–frequency maps obtained with short-time Fourier
transform of the heterodyne beat detection of the individual FMCW channels.
Top left to bottom right panels denote optical carriers between 192.1 THz and
196 THz. Modulation frequency is 100 kHz. The pump channel at 193 THz is
outlined in purple. b, As for a, but for modulation frequency 10 MHz.