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