{HEAD ~ The transducer array} is mounted on {TAIL ~ a carriage assembly} which moves back and forth on a pair of rails inside a fluid compartment in the probe 
is mounted on
{ HEAD ~ The transducer array } is mounted on { TAIL ~ a carriage assembly } which moves back and forth on a pair of rails inside a fluid compartment in the probe
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH