{HEAD ~ A processor}, connected to {TAIL ~ each} of the pressure sensors, sorts a relative difference between the signals supplied by the sensors during dust filling 
connected to
{ HEAD ~ A processor } , connected to { TAIL ~ each } of the pressure sensors , sorts a relative difference between the signals supplied by the sensors during dust filling
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH