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