target evaluating means for viewing said luminescent target means and for processing luminescent values at selected test points to develop {HEAD ~ test values} as {TAIL ~ a function} of luminescent values; and 
as
target evaluating means for viewing said luminescent target means and for processing luminescent values at selected test points to develop { HEAD ~ test values } as { TAIL ~ a function } of luminescent values ; and
OTH OTH OTH OTH OTH OTH OTH 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 TAIL OTH OTH OTH OTH OTH