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