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Cosine fit of the 24-h period of LH→T cross-ApEn profile in a 21-yr-old man. The unsmoothed curve is the MVcross-ApEn(T∣LH) profile, and the smoothed curve is the cosine fit. Top: the fit over all observations (5,410 min, x-grid at 8 AM). Bottom: the look of the fit of the 1st day of the 4 days with the x-axis clock time.
