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Figure 8

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a) Time-normalised Cherenkov radiation spectra measured with a 480 MeV proton beam, taken with HEPI detectors mounted with a range of radiators: i: MgF2, ii: fused silica and iii: PbF 2 . b) The same HEPI configurations as a), impinged by a 355 MeV proton beam.

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