Equivalent width and relative line flux of the He i λ4713 emission in our direct line of sight in STIS data since 1998 March (filled squares). The line was integrated between ~4711.5 Å and 4721.5 Å (we varied the blue side of this range somewhat to exclude the absorption component) with a continuum interpolated between 4601−4611 Å and 4739−4742 Å. The open squares show the continuum variation between ~4711.5 Å and 4721.5 Å. Phases 0.0, 1.0, 2.0, and 3.0 are indicated with vertical lines. The relative line flux and continuum were normalized to unity at phase 0.6. The He i λ4713 line flux increased by more than a factor of ~8 in 2009−2014 compared to 1998−2003, while the continuum increased by a factor of ~5. During the 2014 event, the line became tremendously bright.
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