Phase Markers from Six Method Types of Analyzing Melatonin Data.

<p>Diagram of the phase markers from six methods used to analyze a single melatonin profile (subject 1849v). The upper panel includes the assayed melatonin values, plotted as melatonin concentration (pmol/L). The lower panel groups the various phase markers by method and indicates their position with respect to upper panel. Fourier-based analysis methods F(2) and F(3) have been combined in this diagram because of their similarity.