Extended Data Fig. 3: Analysis of pressure-dependent NMR spectra with different CDW models.

a, Different V sites in a stripe-like CDW order with unidirectional 4a₀ modulation. Different colored dots represent different V sites. b–d, Analysis of NMR spectra with stripe-like CDW order with a unidirectional 4a₀ modulation. Black circles are experimental data points. Red lines are the sum of all fitting curves. The two colourful peaks with the same intensity in b and f represent two ⁵¹V sites in triple-Q CDW order. The five colorful peaks with an intensity ratio of 1:1:2:4:4 in c are the fitting result with stripe-like CDW order. The spectrum in d can be fitted by a combination of triple-Q CDW order and stripe-like CDW order. The fitting constraint for both CDW orders in d is the same as that in b and c. e, different V sites in a superimposed tri-hexagonal and star-of-David model. f–h, Analysis of NMR spectra with the superimposed tri-hexagonal and star-of-David model. The NMR spectrum for triple-Q CDW at ambient pressure is well explained by the tri-hexagonal (or star-of-David) model³³. The star-of-David (or tri-hexagonal) modulation also splits the NMR spectrum into two peaks but the position should be different from that in tri-hexagonal modulation. Therefore, the superimposed tri-hexagonal and star-of-David model should exhibit two sets of double peaks in the NMR spectrum. Obviously, this kind of model cannot fit the NMR spectrum under 1.05 GPa in g. Moreover, the NMR spectrum in h cannot be fitted by a combination of two kinds of triple-Q CDW orders in f and g. All data come from sample B. Each table below the figure shows the fitting parameter and fitting constraint used

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