{HEAD ~ The two pairs} of {TAIL ~ signals} are signal processed to enhance resolution of the ring laser readout 
{ HEAD ~ The two pairs } of { TAIL ~ signals } are signal processed to enhance resolution of the ring laser readout
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH