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Fig. 3.

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Left panel shows best descriptions (solid red lines) of the multi-epoch broad Hα (solid circles plus error bars in blue) in AT 2018hyz by the elliptical accretion-disk model. The corresponding Δt and outer boundary of the disk-like BLRs for each broad Hα are marked as red characters. Right panel shows the corresponding results through the circular accretion-disk plus spiral-arm model.

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