based on the H$\alpha$/H$\beta$, H$\gamma$/H$\beta$, and H$\delta$/H$\beta$ ratios. The resulting Balmer ratios are within errors of the @storey87 Case B values for all objects meeting the selection criteria of our “Select" sample (see § \[sec:Gold\]), with an average of $\chi^2=0.03$.

Following @lee04, the reddening value can be converted to the logarithmic extinction at H$\beta$ as $$c(\mbox{H}\beta) = 1.43\ E(B-V).
    \label{eq:cHbeta}$$ Our reddening corrections are tabulated in Table \[tbl3\].

“Direct" OXYGEN ABUNDANCE DETERMINATIONS {#sec:metallicity}
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Accurate “direct" oxygen abundance determinations from regions require a measurement of the electron temperature (typically via observation of the temperature sensitive auroral \[\] $\lambda$4363 line). For the 31 low-luminosity objects for which \[\] $\lambda$4363 strengths were measured to be $> 4\sigma$, we use the temperature sensitive ratio comparing “auroral" to “nebular" collisionally excited lines to determine electron temperatures. A simple, yet reasonable, approximation to the geometry of an region is to assume a two zone volume, where $t_2$ and $t_3$ are the electron temperatures (in units of $10^{4}$ K) in the low and high ionization zones respectively. For the high ionization zone, the \[\] I($\lambda\lambda$4959,5007)/I($\lambda$4363) ratio was used to derive a temperature using the IRAF task TEMDEN. This task computes the electron temperature of the ionized 