Photometry of the five images of SN Refsdal and light-curve fits using the fiducial light-curve model. The fiducial piecewise polynomial model is shown fit simultaneously to the F125W and F160W (rest-frame approximately V and R) light curves of images S1–SX (solid). The dashed line shows the same model fit after rescaling to match the photospheric and nebular light curves of each image separately. Each legend lists the respective best-fitting factor used to rescale each light-curve component, and we list the ratios between the photospheric- and nebular-phase factors in Table 4. Microlensing that is not achromatic could cause the apparent color of each image to become comparatively bluer or redder. Although not expected given that the galaxy-scale lens is an early-type galaxy, extinction by dust would cause the color to become redder. The color of image S4 is much bluer than the average color of Refsdal images.