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Fig. 9.


Top panel: Swift grism spectra spanning the dust event for V5668 Sgr, from day 80 through day 420. The colors refer to the stage indicated in the light curve (right, note that latest date is at the top of the light curve column). Bottom panel: UVES/VLT spectra spanning the dust forming interval for V5668 Sgr, from day 80 through day 110. The epochs are indicated by the blue squares on the light curve (right, note that the light curve is displayed with latest date at the bottom, the curves align with the photometry). See text for more details.

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