{TAIL ~ The oscillating flow components} are detected with a pair of {HEAD ~ ultrasonic transducers} defining an acoustic path intersecting the vortices 
{ TAIL ~ The oscillating flow components } are detected with a pair of { HEAD ~ ultrasonic transducers } defining an acoustic path intersecting the vortices
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH