Optical and near-IR light curves of PKS 2155−304 during and after the IXPE pointing. Using the largest daily gaps, we binned the data points of each filter. We note that only some of the optical R-band data points are host-galaxy-corrected, and these are labeled as R^†. The average, simultaneous ratio of the polarization degree of the B-band (380–520 nm, i.e., 2.4–3.3 eV), Π_O(B), to the polarization degree of the host-galaxy-corrected R-band (580–695 nm, i.e., 1.8–2.1 eV), Π_O(R^†), is around 1.2 ± 0.2. The gray shaded area shows the IXPE pointing time window. Top: Brightness in magnitudes. Middle: Polarization degree. Bottom: Polarization angle.