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Fig. 1

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Typical KID resonance circle in raw A/D units at the input of the FPGA. The line (red online) represents the (I, Q) data of the frequency sweep around the resonance, and the arrows are the , measured for a 2 kHz modulation of the LO. The largest arrow corresponds to the frequency where the amplitude of the , vector is the largest: this is the frequency used to read out the detector.

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