{HEAD ~ A ratio} of {TAIL ~ IP/IA} of the currents flowing in the terminals P and A is detected 
of
{ HEAD ~ A ratio } of { TAIL ~ IP / IA } of the currents flowing in the terminals P and A is detected
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