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15 Reuter-Stokes model RG-61 (1 atm xenon-methane fill). 16 R. B. Hallock, Phys. Rev. Lett. 23, 830 (1969), and Ref. 3.^Experimental difficulties limited the time available for data collection to that necessary for a single sweep of angles at low temperatures in the run at T = 0.36 K and hence the error bars on those data are larger than those on the data taken at T = 0.41 K. One of these difficulties was a slow temperature oscillation of the order of ±50 mK. The temperature of 0.36 K is thus an average temperature (several oscillations generally oc-13j 14c

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