In a binary system, the value Δe is generally arbitrary, but necessarily depends on the level of noise signals, i.e., a selected value of {TAIL ~ Δe} that is too low may allow noise to be detected as {HEAD ~ an edge} 
In a binary system , the value Δe is generally arbitrary , but necessarily depends on the level of noise signals , i.e. , a selected value of { TAIL ~ Δe } that is too low may allow noise to be detected as { HEAD ~ an edge }
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 TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD