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. 2017 Jan 25;8:14080. doi: 10.1038/ncomms14080

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(a) Difference in arrival times (Δt) for each core of the 290 m length of MCF measured at wavelength λ=531 nm. A black square indicates a pixel with a high DCR. (b) Measured (symbols) and fitted (solid lines) wavelength-dependent arrival times for the MCF cores with the highest and lowest group velocities, as well as the central MCF core.