Based upon the impact force represented by the signal, {HEAD ~ an adjustment} of {TAIL ~ at least one performance parameter} of the moveable barrier operator is determined 
Based upon the impact force represented by the signal , { HEAD ~ an adjustment } of { TAIL ~ at least one performance parameter } of the moveable barrier operator is determined
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH