Fig. 3.
Differential visibility amplitude vs. wavelength for PDS 456 from 2018 August 26 averaged over long baselines (blue circles and error bars) compared with the photometric flux. The orange curve shows a model of an unresolved BLR and a Gaussian continuum. The rise of the differential amplitude following the shape of the line is consistent with a partially resolved continuum, and its amplitude allows an independent measurement of continuum hot dust size.
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