The dip in phase-averaged, energy-resolved X-ray light curves. Left to right: light curves extracted from soft X-ray energy intervals of constant width, compared to the harder 0.5−10.0 keV band. The data are binned into a time resolution of 150 s and normalized to their nondip median count rates. Right panel: corresponding ratios of X-ray soft to X-ray hard light curves, binned into a time resolution of 300 s.