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Table 1.

Variables of the sandpaper used in experiments

Type of sandpaper
VariablesP60P120P280*P400*P0*12 μm
Mean diameter (μm) 269 125 52.2±2.0 35.0±1.5 18.3±1.0 12 
Roughness Ra (μm) 8.464 7.999 5.996 2.408 
F/W from experiments 38 22 26 19 0.9 
Type of sandpaper
VariablesP60P120P280*P400*P0*12 μm
Mean diameter (μm) 269 125 52.2±2.0 35.0±1.5 18.3±1.0 12 
Roughness Ra (μm) 8.464 7.999 5.996 2.408 
F/W from experiments 38 22 26 19 0.9 

Values are means ± S.D. *N=10; roughness data obtained from supplier.

F/W, force ratio (see Fig. 7).

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