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NBS–IPTS–68 (tabular) is a tabular scale based on combining the NBS–1955 scale and the published differences [12] between the NBS–1955 scale and the IPTS–68 scale and numerically smoothing the adjusted scale. The NBS–IPTS–68 is based on the relation given by eq (1) and the “best” deviation functions ΔW(T) derived from NBS–IPTS–68 (tabular).
