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