{TAIL ~ The displacements} are selected to reduce the overall cyclic error contribution to {HEAD ~ an average position measurement} 
{ TAIL ~ The displacements } are selected to reduce the overall cyclic error contribution to { HEAD ~ an average position measurement }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD