Figure 3 shows most of the thermal expansion data fit by Martin and his recommended equations, expressed as the percent change in length relative to the length at 273 K, ie. Percent deviations of the data from the recommended equations of Martin are shown in Figure 4 . These equations were based on X-ray diffraction measurements. Values calculated from the equations of Momin et al. are consistently lower than the recommended values. Thus, the results reported by Momin et al. appear to be low relative to other data as well as compared to the recommendation of Martin.
Differences are significant at high temperatures where the fits are based on different sets of data.
He made a zero error correction to the data of Murray and Thackery.