The dust bag is angled relative to the wall and pressure sensors fill {HEAD ~ the space} between the wall and {TAIL ~ dust bag} 
between
The dust bag is angled relative to the wall and pressure sensors fill { HEAD ~ the space } between the wall and { TAIL ~ dust bag }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL