\begin{document}$ X(3872) $\end{document} state in the \begin{document}$ J/\psi\pi^+\pi^- $\end{document} and \begin{document}$ D^0\bar{D}^0\pi^0 $\end{document} decay channels. The quantum number and mass of the \begin{document}$ X(3872) $\end{document} state allow us to exploit the universal feature of the very near-threshold \begin{document}$ D\bar D^* $\end{document} scattering in the S wave. The analysis of \begin{document}$ J/\psi\pi^+\pi^- $\end{document} and \begin{document}$ D^0\bar{D}^0\pi^0 $\end{document}data separately, as well as the combined analysis of these data together, all support the conclusion that \begin{document}$ X(3872) $\end{document} is an extremely weakly bound charm meson molecule."> Nature of <i>X</i>(3872) from recent BESIII data: considering the universal feature of an <i>S</i>-wave threshold resonance -
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