strength or a combination of both as an example the wires could be connected around the outermost turn at points 208 206 220 and 210 at 60 u00b0 120 u00b0 180 u00b0 and 300 u00b0 respectively but other angles can also be used similarly the capacitors are connected to the opposing outermost coil of l sample at points 212 218 216 and 214 in addition although four capacitors are shown in the figure more than four connections can be used for improved homogeneity at the 1 h frequency the capacitors form low impedance paths across the solenoid coil l sample so that only portions of the outmost turns of the solenoid coil are part of the 1 h circuit at the 1 h frequency the capacitors and the connecting wires and the portions of the outmost turns of the solenoid coil form a bird cage resonator the high inductance of the solenoid coil effectively u201c stops u201d the 1 h frequency so that the solenoid coil is not part of the 1 h circuit therefore the 1 h circuit is formed from portions of the outermost turns of the sample coil l sample capacitors c 1 c 2 c 3 and c 4 and capacitors c th c h and c mh the values of capacitors c 1 c 2 c 3 and c 4 are chosen so that the self resonance frequency of the circuit including the sample coil portions plus the capacitors is high enough.