Fig. 12.
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Correlations between the continuum flux at 5800 Å, and the flux of Hα (left), Hβ (middle), and total broad Fe II blend (right) in units of 10−15 erg s−1 cm−2. The color-bar indicates the day after MJD 57577. The clear correlation of the continuum and line fluxes (apart from the first three epochs) supports the photoionization as the main heating source (see text for details).
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