NXB spectra using the script `xisnxbgen` [@tawa_etal08]. This creates an NXB spectrum using a weighted sum of *Suzaku* of the Earth at night based on the exposure times. The only unique parameter we supplied to the script is the same constraint of COR $>$8 GV that we applied to the initial data extraction. Different SXRB studies have multiple treatments for these NXB spectra, with groups either subtracting the NXB counts from the observed spectrum or including the NXB spectrum as additional data and simultaneously modeling its contribution to the full spectrum [e.g., @smith_etal07]. We follow the latter methodology, meaning we fit both our observed spectrum and the NXB spectrum as one process.

Our spectral model includes the following components: NXB spectrum, an absorbed cosmic X-ray background (CXB) or extragalactic power law, an absorbed hot gas continuum component with no oxygen emission lines, and the and lines of interest. The absorbed components were attenuated using the `phabs` model in Xspec [@bc_mccammon92; @yan_etal98] and had column densities fixed to values from the LAB survey [@kalberla_etal05]. We also assume metal abundances from @asplund_etal09 unless otherwise stated. The rest of this section details the spectral model assumed for each source.

The NXB model includes 