Because the transmission structure uniformly transfers signals, {TAIL ~ the relative condition} of the signals as they enter or leave each end will substantially match the condition of the signals as measured or presented by the reference unit, thereby enabling calibration of the network in reference to the device probing {HEAD ~ ends} 
Because the transmission structure uniformly transfers signals , { TAIL ~ the relative condition } of the signals as they enter or leave each end will substantially match the condition of the signals as measured or presented by the reference unit , thereby enabling calibration of the network in reference to the device probing { HEAD ~ ends }
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