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The method we have used is based on [S. V. Grigoriev et al. Phys. Rev. B \\textbf{92} 220415(R) (2015)] and was extended here for the application in polycrystalline samples. We confirm the validity of the anisotropic spin-wave dispersion for FeGe caused by the Dzyaloshinskii-Moriya interaction. 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