\begin{document}$ - $\end{document}100 TeV and \begin{document}$ > $\end{document}100 TeV with high significance, by analyzing the KM2A data of 136 live days between December 2019 and May 2020. With the observations, we test the detector performance, including angular resolution, pointing accuracy and cosmic-ray background rejection power. The energy spectrum of the Crab Nebula in the energy range 10-250 TeV fits well with a single power-law function dN/dE = (1.13\begin{document}$ \pm $\end{document}0.05\begin{document}$ _{\rm stat} $\end{document}\begin{document}$ \pm $\end{document}0.08\begin{document}$ _{\rm sys} $\end{document})\begin{document}$ \times $\end{document}10\begin{document}$ ^{-14} $\end{document}\begin{document}$ \cdot $\end{document}(E/20 TeV)\begin{document}$ ^{-3.09\pm0.06_{\rm stat}\pm0.02_{\rm sys}} $\end{document} cm\begin{document}$ ^{-2} $\end{document} s\begin{document}$ ^{-1} $\end{document} TeV\begin{document}$ ^{-1} $\end{document}. It is consistent with previous measurements by other experiments. This opens a new window of γ-ray astronomy above 0.1 PeV through which new ultrahigh-energy γ-ray phenomena, such as cosmic PeVatrons, might be discovered."> Observation of the Crab Nebula with LHAASO-KM2A − a performance study -
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