Light curves of HE0435-1223. This figure shows the time-delay-corrected light curves of the four images of HE0435-1223 in the R band (left) and V band (right) with the same time and magnitude ranges, with 1σ magnitude errors. Inside the left panel, we inserted the DIA reference image of HE0435-1223 in the R band (linear in flux) as an example. The image size is 9 arcsec × 9 arcsec. Quasar image A is on the right, and images B, C, and D follow clockwise. Here, image B appears to be the brightest, since the R band reference image is combined mostly from images from the year 2022.