The underlying signal of {HEAD ~ the jittering test signal}, however, continues to be {TAIL ~ the originally generated test signal} 
The underlying signal of { HEAD ~ the jittering test signal } , however , continues to be { TAIL ~ the originally generated test signal }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL