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. 2023 Aug 21;14:5081. doi: 10.1038/s41467-023-40757-1

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© The Author(s) 2023

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Fig. 3 — The overlay shows the stopping depth distribution of muons with an energy of 19 keV, corresponding to an average stopping depth of 54 nm (x = −2 nm in Fig. 2). At this energy roughly half of the muons come to rest in the Nb layer, probing its first 30–35 nm, yet the integrated flux expulsion is close to zero.