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. 2016 Jul 19;9(7):589. doi: 10.3390/ma9070589

Figure 5.

Figure 5

Figure 5

(a) Cross section of a sample treated 1 h at 150 °C in air; (b) Cross section of a sample treated 1 h at 150 °C in vacuum; (c) Cross section of the core of a sample treated 1 h at 150 °C in vacuum.