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We combine data from eight leading air shower experiments to cover shower energies from PeV to tens of EeV. Data are combined using the <jats:italic>z<\/jats:italic>-scale, a unified reference scale based on simulated air showers. Energy-scales of experiments are cross-calibrated. Above 10 PeV, we find a muon deficit in simulated air showers for each of the six considered hadronic interaction models. The deficit is increasing with shower energy. 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