{HEAD ~ The output} from the accelerometers may be integrated to quantify {TAIL ~ movement} of the array 
{ HEAD ~ The output } from the accelerometers may be integrated to quantify { TAIL ~ movement } of the array
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH