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