Color-magnitude and color-color diagrams of DR Tau. The filled blue circles show the data obtained in 2009, the filled orange circles indicate the 2017 data, and the green circles display the 2021/22 data. We note that, for better comparability, the 2021/2022 data in the V−R vs. V and the R−I vs. V diagrams were converted from the Sloan r and i filters to the Cousins R_C and I_C filters using the relations by Jordi et al. (2006). The black arrows in each panel indicate a change corresponding to A_V = 1 mag, except for the 3.6−4.5 vs. 3.6 mid-infrared color-magnitude diagram, where it corresponds to A_V = 3 mag.