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