providing a sensor in {HEAD ~ a substantially fixed position} relative to {TAIL ~ the insulation} in the cavity, wherein the sensor is an air cup that is pressed against the insulation 
relative to
providing a sensor in { HEAD ~ a substantially fixed position } relative to { TAIL ~ the insulation } in the cavity , wherein the sensor is an air cup that is pressed against the insulation
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH