Each of {TAIL ~ the capacitors} is formed of {HEAD ~ a series circuit} of two substantially equal size individual capacitors forming a capacitor pair 
Each of { TAIL ~ the capacitors } is formed of { HEAD ~ a series circuit } of two substantially equal size individual capacitors forming a capacitor pair
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH