{HEAD ~ The system} 1, wherein {TAIL ~ the detector} includes a pressure sensor in the bed 
wherein
{ HEAD ~ The system } 1 , wherein { TAIL ~ the detector } includes a pressure sensor in the bed
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH