Synthetic Hα and continuum light curves. The solid red and blue lines show the Hα and continuum models estimated by SPEAR respectively. The red and blue area (enclosed by the dashed line) represent the expected variance about the mean light curve model. The original Hα light curve is computed by subtracting a scaled r curve from the SII curve and re-normalizing it to mean = 1 (red dots). The Hα light curve is vertically shifted by 0.2 with respect to the continuum light curve (blue dots) for clarity.