{TAIL ~ The performance data} is used to optimize the models by adjusting {HEAD ~ element values} of constituent elements of the models 
{ TAIL ~ The performance data } is used to optimize the models by adjusting { HEAD ~ element values } of constituent elements of the models
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH