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Extended Data Fig. 1 | Instrumentation set-up for the lock-in transport
measurements. Illustration of the set-up and relevant signals for the lock-in
transport measurements. The AWG is used to generate alternating pulse cycles
consisting of a repeated measurement and a repeated reference. The signal is
demodulated in a lock-in amplifier to give a direct measure of the difference
between the two measurements and subtract slow variations in the transport
signal.