The resistor {HEAD ~ R1} and the two capacitors C1 and C2 serve to dimension {TAIL ~ the circuit} 
serve to dimension
The resistor { HEAD ~ R1 } and the two capacitors C1 and C2 serve to dimension { TAIL ~ the circuit }
OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL