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. 2022 Sep 2;11:261. doi: 10.1038/s41377-022-00951-0

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Fig. 6 — a The picture of the packed iodine absorption cell integrated with the temperature controller. The light enters the device from the left and leaves from the right. b Illustration of the spectral discrimination, where the iodine cell (black line) filters the signal (blue line) by rejecting the particulate and molecular Rayleigh signals and transmitting molecular Brillouin signal (blue shadow)