Fig. 5: Comparison between the observed and the calculated 75As NMR spectra.

a The external magnetic field evolution of the observed 75As NMR spectra in \({{\bf{B}}}_{{\rm{ext}}}\parallel [1\bar{1}0]\). The spectra are plotted against the absolute value of the local magnetic field subtracted by demagnetization and Lorentz cavity fields. b and c The histograms of the distributed local fields for b an incommensurate helix state and c an incommensurate semi-circle fan state with the uniform spin distribution in some in-plane external magnetic fields. The inset in b represents the schematic figures for the orientation of the ordered moments which produce the local fields pointed by the dotted lines.