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