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. 2021 Feb 9;21(4):1212. doi: 10.3390/s21041212

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Coil current and OPM photodiode output. The optical pumping started $28 μ s$ after initiating the coil shut-off. The signal distortion prior the pump pulses (i.e., periods $- 0.2 m s$ to $0 m s$ and $0.8 m s$ to $1 m s$ ) is caused by the electrical heater of the OMG.