The wells may vary in size and depth depending upon the penetration of {TAIL ~ the laser beam} into the panel of {HEAD ~ substrate material} 18 
The wells may vary in size and depth depending upon the penetration of { TAIL ~ the laser beam } into the panel of { HEAD ~ substrate material } 18
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH