A correction algorithm, in the form of a model control loop allows {HEAD ~ permanent improvement} of {TAIL ~ accuracy} when the model parameters are inexact 
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A correction algorithm , in the form of a model control loop allows { HEAD ~ permanent improvement } of { TAIL ~ accuracy } when the model parameters are inexact
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH