Table 1 In vivo coupling and matching, S-parameters (dB) averaged over four subjects (2 females, 2 males).

From: Proton-decoupled carbon magnetic resonance spectroscopy in human calf muscles at 7 T using a multi-channel radiofrequency coil

frequency 13C array @ 74.7 MHz 1H array @ 297.2 MHz
channel ch 1 ch 2 ch 3 ch 1 ch 2 ch 3 ch 4
ch 1 −19.6 −19.9 −17.2 −17.3 −15.2 −17.9 −16.1
ch 2 −19.9 −17.8 −21.2 −15.2 −24.0 −17.3 −15.3
ch 3 −17.2 −21.2 −19.6 −17.9 −17.3 −18.7 −14.3
ch 4 −16.1 −15.3 −14.3 −24