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In the proposed scheme temperatures are defined by interpolation and extrapolation with respect to two reference fixed points (n=2), with assigned temperatures. The definition includes one full‐range and two sub‐ranges in temperature. The scheme in question will be compared with two alternatives referred to (1) as n=1, using one reference point only, as in the ITS‐90, and (2) as n=0, involving direct measurement of the thermodynamic temperature by means of absolute radiometry.