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