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Time–temperature characteristics of M series modules. The characteristic curve shows that no deformation occurs at 45 °C, and deformation starts to occur above 55 °C. The change is most dramatic in the first 2 h. Values are the means ± SD, n = 10, #p > 0.05, *p < 0.05, **p < 0.01, and ***p < 0.001 versus previous time point of the indicated module.
