Observed (black solid line) and best-fit synthetic (red dashed line) Hα profiles for different epochs. Top row (from left to right): spectra of May 1999, May 2000, March 2002, and January 2011. Middle row: data from April 2012, December 2013, October 2014, and December 2014. Bottom row: data from February 2015, October 2015, January 2016, and March 2016. All panels have the same vertical scale, except for the March 2002 and December 2013 spectra.
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