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