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Evaluation of the grain size as a function of temperature as determined by the analysis of the TEM dark-field images taken with fundamental reflections. (a–c) Histograms of the grain size distribution together with their log-normal fits of samples annealed to 220, 370 and 500 °C, respectively. Median values of the measured data are indicated. (d) Median values of the grain size as a function of temperature.
