{HEAD ~ The optimized models} are used to calibrate the test system such that the test system corrects for any imperfections in performance measurements taken of a device under {TAIL ~ test} measured by the calibrated test system 
{ HEAD ~ The optimized models } are used to calibrate the test system such that the test system corrects for any imperfections in performance measurements taken of a device under { TAIL ~ test } measured by the calibrated test system
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH