Same as Fig. 2 but for a post-AGB star with strong pulsational variability (RV Tau itself). The upper and lower panels show optical and near-IR photometry at visual maximum and minimum pulsation phases, respectively. For visual reference we also include photometry for which no proper phase attribution can be made (mainly Tycho-2, 2MASS, and all mid- and far-IR data). In some cases these data may correspond to a different RVb phase.