Equivalent width of the Hα emission during the 1998, 2003, 2009, and 2014 events (squares: HST STIS, diamonds: VLT UVES, triangles: Gemini GMOS, asterisks: CTIO SMARTS 1.5 m CHIRON, plusses: Richardson et al. 2010). The timing of the equivalent widths at FOS4 are corrected for the additional light travel time (tFOS4 = t + 18 d).
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