Fig. 2
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Continuum-normalized Hα, Hβ, and Hγ line profiles observed by LAMOST (red), compared to a Lorentz profile (gray) fit to the respective latest spectrum. All spectra are shifted to the rest frame of the respective latest observation. From top to bottom, the observing dates are 22 May 2013, 04 September 2013, 13 September 2014, 1 October 2015, 15 May 2017 and 14 June 2017, respectively.
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