{HEAD ~ A method} and system for calibrating {TAIL ~ a test system} and a vector network analyzer use models of unknown calibration standards for a standards based calibration 
for calibrating
{ HEAD ~ A method } and system for calibrating { TAIL ~ a test system } and a vector network analyzer use models of unknown calibration standards for a standards based calibration
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH