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. 2015 Apr 24;6:7021. doi: 10.1038/ncomms8021

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Transmission modulation with an external electrical control signal at different frequencies without magnetic field. Detection at twice the frequency of modulation 2f. Modulation depth as a function of (a) frequency and (b) electrical modulation amplitude. Error bars show the s.d. and dashed lines are quadratic fits through the origin.