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