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