Oxygen abundance vs. absolute sech magnitude in ﹩K_{s}﹩ for BCDs. ﹩T_{e}﹩‐based abundances are plotted as filled symbols and ﹩R_{23}﹩‐based abundances as open symbols. We include errors in metallicities. Typical errors for absolute magnitudes are ~0.1 mag. One outlier is labeled. The geometric mean fit to the other BCDs is plotted as a dashed line.