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hand to expose the section instead. Samples were then mounted onto glass slides using Araldite 2020 resin and ground manually using 35 um, 15.3 um, 10.3 tm and 5 um grits to 80-100 um thickness. Sections were finished by polishing with 0.3 um alumina oxide powder using a Logitech automatic polishing machine.

Figure 3 hand to expose the section instead. Samples were then mounted onto glass slides using Araldite 2020 resin and ground manually using 35 um, 15.3 um, 10.3 tm and 5 um grits to 80-100 um thickness. Sections were finished by polishing with 0.3 um alumina oxide powder using a Logitech automatic polishing machine.