Top panel: the optical/UV (black filled squares) and X-ray (red filled squares) time delays. The dashed and solid lines correspond to the optical/UV and X-ray best-fit parabolic curve. Middle panel: residuals with respect to the X-ray best-fit parabolic curve. Bottom panel: residuals with respect to the optical/UV best-fit parabolic curve. (This figure is available in color in the electronic form.)
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