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Curve No.6 (Name: Zhenya; Age: 4 months). Pneumographic curve at the onset of period with increased rapidity of breathing. Figure is from [Denisova, M. P. and Figurin, N. L. (1926). Periodic phenomena in the sleep of children. Novoe v refleksologii i fiziologii nervnoi sistemy, 2, 338–345]. This material is provided solely for scientific and educational uses.
