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