To guard against this, the polymer sealing film 71 should be thick enough to account for any sagging into the conduits 70 while maintaining {HEAD ~ the seal} over {TAIL ~ the etched channels} 77 
over
To guard against this , the polymer sealing film 71 should be thick enough to account for any sagging into the conduits 70 while maintaining { HEAD ~ the seal } over { TAIL ~ the etched channels } 77
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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