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A: Sketch of pure-xenon clusters spontaneously formed in the glassy matrix of solid xenon/1-propanol/trityl mixture upon warming up to ~125 K. B: The narrow peak in 129Xe NMR spectra corresponds to pure xenon clusters. C: The broad 129Xe peak corresponds to solid xenon/1-propanol/trityl mixture. D: Region of the glassy matrix containing the cluster is modeled by two concentric spheres of radii R2 and R1 respectively.
