FIG 1 illustrates the basic principle of {HEAD ~ the trace} according to {TAIL ~ the invention} 
according to
FIG 1 illustrates the basic principle of { HEAD ~ the trace } according to { TAIL ~ the invention }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL