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We present a measurement of the high-energy astrophysical muon-neutrino fluxwith the IceCube Neutrino Observatory. The measurement uses a high-purityselection of ~650k neutrino-induced muon tracks from the Northern celestialhemisphere, corresponding to 9.5 years of experimental data. With respect toprevious publications, the measurement is improved by the increased size of theevent sample and the extended model testing beyond simple power-law hypotheses.An updated treatment of systematic uncertainties and atmospheric backgroundfluxes has been implemented based on recent models. The best-fit singlepower-law parameterization for the astrophysical energy spectrum results in anormalization of $\phi_{\mathrm{@100TeV}}^{\nu_\mu+\bar{\nu}_\mu} =1.44_{-0.26}^{+0.25} \times10^{-18}\,\mathrm{GeV}^{-1}\mathrm{cm}^{-2}\mathrm{s}^{-1}\mathrm{sr}^{-1}$ anda spectral index $\gamma_{\mathrm{SPL}} = 2.37_{-0.09}^{+0.09}$, constrained inthe energy range from $15\,\mathrm{TeV}$ to $5\,\mathrm{PeV}$. The model testsinclude a single power law with a spectral cutoff at high energies, alog-parabola model, several source-class specific flux predictions from theliterature and a model-independent spectral unfolding. The data is wellconsistent with a single power law hypothesis, however, spectra with softeningabove one PeV are statistically more favorable at a two sigma level.

Improved Characterization of the Astrophysical Muon-Neutrino Flux with 9.5 Years of IceCube Data