Cutouts of the color evolution shown in Fig. 6 for each outburst with available data. Each cutout shows the time interval from 50 days prior to the estimated time of maximum light based on Eq. (1) to 150 days afterward. The respective time of outburst is marked by an arrow (black for known outbursts and gray for suspected and newly detected ones) and the gray shaded area corresponds to its uncertainty in the same way as in Fig. 6. Orange data points correspond to g − r, green to g − i, and purple to r − i. The color with the best sampling is connected by a solid black line. The blue dashed line shows the r-band light curve for comparison.