Upper panel: The BVI_c light curves for star 2 (Macri et al. 2001; Pellerin & Macri 2011). V-band photometry from Shporer & Mazeh (2006) is shown as green triangles, corrected by 0.25 mag. Uncertainties are indicated with error bars. The dashed line at JD 2 451 680 (mid-May 2000), serves as an approximation for the date when the fading event reaches a minimum. Middle panel: A zoomed view of the best-fit temperatures for star 2 from Fig. 7. Lower panel: Same as in the middle panel, but having visual extinction (green crosses) as a free parameter. A green line indicates the average extinction of M 33, at A_V = 0.4 mag.