Similar to Fig. 5, but for ι Lyr. Top-left panel: TESS light curve (black) with the low-frequency trends (<0.5 d⁻¹) in red. Top-right panel: All NRES spectra (black curves), with the pre-outburst average profile in red. Bottom-right panel: NRES and DAO emission Hα profiles after subtracting off the pre-outburst average. Middle- and bottom-left panels: Hα EW and EW_V/EW_R, respectively with gray markers indicating amateur data, blue from DAO, and red from NRES. In the bottom-left panel, six vertical lines indicate epochs that are highlighted in the corresponding colors in the bottom-right panel. The dashed line is pre-outburst, and the green is the first professional spectrum after the start of the event.