Figure 4.
Topography of the original GF surfaces for the density of 1.0 g/cm3 (a,d,g), 1.3 g/cm3 (b,e,h), 1.6 g/cm3 (c,f,i) by the fractions of 40–80 μm (a–c), 160–200 μsam (d–f), and >500 μm (g–i).
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