{HEAD ~ A depth Dp} of each striation satisfies {TAIL ~ 10 μm≦Dp≦40} μm 
satisfies
{ HEAD ~ A depth Dp } of each striation satisfies { TAIL ~ 10 μm≦Dp≦40 } μm
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH