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