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Measurements beyond the roton require access to high wave vectors (up to Q = 4 \\AA$^{-1}$) with excellent energy resolution and high statistical precision. The present results show for the first time that at T = 0.5 K the P-R mode in MCM-41 extends out to wave-vector Q$\\simeq$3.6 \\AA$^-1$ with the same energy and zero width (within precision) as observed in bulk superfluid 4He. 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