As such, {HEAD ~ vibration events} occurring during {TAIL ~ seismic surveys} do not need to be slowed or delayed 
occurring during
As such , { HEAD ~ vibration events } occurring during { TAIL ~ seismic surveys } do not need to be slowed or delayed
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH