{TAIL ~ These parameters} are used to specify a piecewise continuous function of {HEAD ~ time} as an input signal 
{ TAIL ~ These parameters } are used to specify a piecewise continuous function of { HEAD ~ time } as an input signal
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH