Oxygen abundance vs. absolute sech magnitude in ﹩K_{s}﹩ for dIs. ﹩T_{e}﹩‐based abundances are plotted as filled symbols and ﹩R_{23}﹩‐based abundances as open symbols. Errors in metallicities are shown as vertical bars. Typical errors for absolute magnitudes are ~0.1 mag. Four outliers are labeled in the plot. The geometric mean fit to other dIs is plotted as a dashed line.