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(a) Macro-traces (30x) long, deep striations alternate with more superficial striations, with different orientations. They are located on the flat and/or on the long edge of the instrument; (b) micro-traces (200x), striations with polishes on the bottom, with rough texture; (c) 3D microtopography of the unused surface and profile; (d) 3D microtopography of the used surface and profile.
