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