The housing may have holes to accommodate {HEAD ~ a pad} that seats against {TAIL ~ the individual sensing lines} 
seats against
The housing may have holes to accommodate { HEAD ~ a pad } that seats against { TAIL ~ the individual sensing lines }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL