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