In {HEAD ~ alternative embodiments}, {TAIL ~ the signal} 210 a.1 may be supplied by data processor 180, or by any other available source 
In { HEAD ~ alternative embodiments } , { TAIL ~ the signal } 210 a.1 may be supplied by data processor 180 , or by any other available source
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH