Fig. 4.

Detrended spectroscopic light curves used in the time delay analysis. From top to bottom: f5100 continuum and Hβ and Hγ line light curves. The units are 10−15 erg s−1 cm−2 Å−1 for f5100 and 10−15 erg s−1 cm−2 for the line light curves. The point above 2 × 10−15 erg s−1 in the f5100 light curve is excluded from the time delay analysis.
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