Figure 6.
Surface parameters: (a) Pa/Wa/Ra, (b) Pq/Wq/Rq, (c) Psk/Wsk/Rsk, (d) Pku/Wku/Rku, (e) Pt/Wt/Rt, (f) PSm/WSm/RSm, (g) Pc/Wc/Rc, (h) Pdq/Wdq/Rdq and (i) PPc/WPc/RPc.
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