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19 34.8 90.568.5.04 13.4 27.139.4.35 10.9 22. 110.queness.Nevertheless, in principle the IPTS should be unique and to achieve this, a wavelength, presumably 0.65 pm, since this is the wavelength used in the majority of optical pyrometers, must be specified in the definition.
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Terrien et al. (1967) studied this question.
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