In FIG 23, the ordinate indicates the signal amplitude in arbitrary units, {HEAD ~ the abscissa} indicates {TAIL ~ the time} in arbitrary units, and a solid line indicates an ideal waveform r 
indicates
In FIG 23 , the ordinate indicates the signal amplitude in arbitrary units , { HEAD ~ the abscissa } indicates { TAIL ~ the time } in arbitrary units , and a solid line indicates an ideal waveform r
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH