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For VSI recording, 1-bit sampling and 8 MHz bandwidths ((e.g. R1 and R4 experiments):
mk5=mode=ext:0x55555555:2
For VSI recording, 1-bit sampling and 4 MHz bandwidths (e.g. APSG, CRF, OHIG and T2 experiments)
mk5=mode=ext:0x55555555:4