The current amplitudes are set to produce {HEAD ~ a series} of {TAIL ~ spatial current patterns}, all orthogonal to each other, and each applied for only a short time interval while voltages are measured 
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The current amplitudes are set to produce { HEAD ~ a series } of { TAIL ~ spatial current patterns } , all orthogonal to each other , and each applied for only a short time interval while voltages are measured
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH