For example, {HEAD ~ the optical surface} of a mold half can be corona treated to modify {TAIL ~ the surface properties} 
For example , { HEAD ~ the optical surface } of a mold half can be corona treated to modify { TAIL ~ the surface properties }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL