Data-driven muon-calibrated neutrino flux

In this paper, we present a refined calculation of the atmospheric neutrino flux spanning from GeV to PeV energies. Our method, Daemonflux, utilizes data-driven inputs and incorporates adjustable parameters take their uncertainties into account. By optimizing these using combination muon data constraints fixed-target experiments, achieve in calculated fluxes less than 10% up 1 TeV, with ratios constrained below 10%. model performs particularly well at energies 100 GeV, where smallest errors are obtained. We make our available as software package that provides access predictions fluxes, ratios, errors, including covariance matrix obtained fit.