The ends of each set of resistors are coupled together to form two neutral points which are electrically asymmetrical to each other because of the selection of resistors having {HEAD ~ different resistance values} of {TAIL ~ the assigned resistors} 
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The ends of each set of resistors are coupled together to form two neutral points which are electrically asymmetrical to each other because of the selection of resistors having { HEAD ~ different resistance values } of { TAIL ~ the assigned resistors }
OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL