The most important parameters are an azimuth angle relative to a particular direction, a spatial frequency f or a number of {HEAD ~ grooves} per {TAIL ~ millimeter}, a relief profile shape, 30 and 
per
The most important parameters are an azimuth angle relative to a particular direction , a spatial frequency f or a number of { HEAD ~ grooves } per { TAIL ~ millimeter } , a relief profile shape , 30 and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH