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Fig. 2.

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Observed fp line (in black, linear scale) superimposed on the supply interference line (in red) scaled in amplitude and shifted in frequency. The fp line profile was obtained by averaging 45 300 good-quality spectra which were shifted to a common central frequency, fitted to a Gaussian profile, and acquired within the period shown in Fig. 1. The total power exceeds the background by about 20%, which means that the contribution of the line amounts to roughly 20% of the background.

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