{HEAD ~ The filter system} filters {TAIL ~ the excursion signal} to remove unwanted frequency components from the excursion signal 
{ HEAD ~ The filter system } filters { TAIL ~ the excursion signal } to remove unwanted frequency components from the excursion signal
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH