a) means for storing {TAIL ~ values} of voltage and power measurements made at {HEAD ~ the load}, 
a ) means for storing { TAIL ~ values } of voltage and power measurements made at { HEAD ~ the load } ,
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH