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. Author manuscript; available in PMC: 2018 Apr 15.
Published in final edited form as: Neuroimage. 2017 Feb 17;150:329–335. doi: 10.1016/j.neuroimage.2017.02.025

Fig. 2.

Fig. 2

The correlation between the locus coeruleus signal intensity based on the contrast-to-noise (CNR) ratio and high frequency heart rate variability (HRV) for younger adults (plotted using circles) and for older adults (plotted using squares).