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