However, both current sources 47, 49 share {HEAD ~ the same leads} for {TAIL ~ current return}, i.e., the leads depicted as columns in the array 
for
However , both current sources 47 , 49 share { HEAD ~ the same leads } for { TAIL ~ current return } , i.e. , the leads depicted as columns in the array
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH