The apparatus is configured to minimize {TAIL ~ the influence} of other joints on {HEAD ~ the rotation analysis} 
The apparatus is configured to minimize { TAIL ~ the influence } of other joints on { HEAD ~ the rotation analysis }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD