FIG. 3.

Bottom row: Power spectral density at 830 cm⁻¹ represented as a percentage of the normalized, integrated power spectrum from the absolute value data. Middle row: Detail of the power spectrum at the 800-850 nm upper cross peak boxed in the bottom row. Top row: Phase of the 830 cm⁻¹ oscillations over the same region, with the saturation determined by the power spectral density from the middle row.