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The IceCube Neutrino Observatory first observed a diffuse flux of high energyastrophysical neutrinos in 2013. Since then, this observation has beenconfirmed in multiple detection channels such as high energy starting events,cascades, and through-going muon tracks. Combining these event selections intoa high statistics global fit of 10 years of IceCube's neutrino data couldstrongly improve the understanding of the diffuse astrophysical neutrino flux:challenging or confirming the simple unbroken power-law flux model as well asthe astrophysical neutrino flux composition. One key component of such acombined analysis is the consistent modelling of systematic uncertainties ofdifferent event selections. This can be achieved using the novel SnowStormMonte Carlo method which allows constraints to be placed on multiple systematicparameters from a single simulation set. We will report on the status of a newcombined analysis of through-going muon tracks and cascades. It is based on aconsistent all flavor neutrino signal and background simulation using, for thefirst time, the SnowStorm method to analyze IceCube's high-energy neutrinodata. Estimated sensitivities for the energy spectrum of the diffuseastrophysical neutrino flux will be shown.

A Combined Fit of the Diffuse Neutrino Spectrum using IceCube Muon Tracks and Cascades