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Example of DSA representation in transition from the period without PLMS to that with PLMS. An arrow on the time axis indicates the beginning of the period with PLMS. Solid lines represent the mean frequency of each frequency bands (HF, LF, VLF); DSA, density spectrum array; PLMS, periodic leg movements during sleep; HF, high frequency; LF, low frequency; VLF, very low frequency.
