{HEAD ~ A second pair} of {TAIL ~ signals} is derived from the first pair of signals in which the second pair are displaced in phase relative to the first pair and are also in phase quadrature 
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{ HEAD ~ A second pair } of { TAIL ~ signals } is derived from the first pair of signals in which the second pair are displaced in phase relative to the first pair and are also in phase quadrature
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH