a first set of {HEAD ~ zero coefficients} extending along {TAIL ~ a direction} traversing said filter through a center position to form a first side and a second side 
extending along
a first set of { HEAD ~ zero coefficients } extending along { TAIL ~ a direction } traversing said filter through a center position to form a first side and a second side
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH