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B \\textbf{91}, 180504 (2015)] the authors, analyzing numerically the steady counterflowing helium in inhomogeneous channel flow, concluded that the production term $\\mathcal{P}$ in the Vinen equation is proportional to $\\left\\vert \\mathbf{V}_{ns}\\right\\vert ^{3}\\mathcal{L}^{1/2}$ (where $\\mathcal{L}$ is vortex line density and $\\mathbf{V}_{ns}$ is the counterflow velocity). 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