Empricial color-T_eff relations applied to high probability members of the five open clusters in this study. Individual stars are connected with lines between subplots to illustrate differences in the relations. We used PanSTARRS griz, 2MASS JHK, and Gaia DR2 BP and RP photometry with the following relations: BP − RP (StarHorse, Anders et al. 2019); g − r, g − i, g − z, g − J, g − H, g − K (Boyajian et al. 2013); BP − RP (Apsis, Andrae et al. 2018); BP − RP (Mann), r − z, and r − J (Mann et al. 2016). The majority of connecting lines show very little slope, indicating that different CTRs are consistent with one another when applied to our sample. As expected, some relations show noticeable systematic differences, especially at the high and low temperature ends of their scopes of validity. We did not count results from Apsis with T_eff <  4100 K because the pipeline systematically overestimated the temperatures for M dwarfs (Andrae et al. 2018; Kesseli et al. 2019).