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RF coil assembly. The 13C coil, the 1H coil (two overlapping octagonal loops), and the RF shield are mounted on the bottom surface of the upper, middle and lower tubes, respectively. Each proton loop has a single-tuned 1H cable trap constructed using the RG-316 cable. A 13C/1H dual-tuned cable trap, built inside a RF shielded box, is connected to the 13C coil.
