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We present emission line templates for passively evolving ("retired")galaxies, useful for investigation of the evolution of the ISM in thesegalaxies, and characterization of their high-temperature source populations.The templates are based on high signal-to-noise ($>800$) co-added spectra($3700-6800$\AA) of $\sim11500$ gas-rich Sloan Digital Sky Survey galaxiesdevoid of star-formation and active galactic nuclei. Stacked spectra areprovided for the entire sample and sub-samples binned by mean stellar age. InJohansson~et al (2014), these spectra provided the first measurements of the HeII 4686\AA\ line in passively-evolving galaxies, and the observed HeII/H$\beta$ ratio constrained the contribution of accreting white dwarfs (the"single-degenerate" scenario) to the type Ia supernova rate. In this paper, thefull range of unambiguously detected emission lines are presented. Comparisonof the observed [O I] 6300\AA/H$\alpha$ ratio with photoionization modelsfurther constrains any high-temperature single-degenerate scenario for type Iasupernovae (with 1.5 $\lesssim$ T/$10^{5}K$ $\lesssim$ 10) to $\lesssim$3-6\%of the observed rate in the youngest age bin (i.e. highest SN Ia rate). Hence,for the same temperatures, in the presence of an ambient population of post-AGBstars, we exclude additional high-temperature sources with a combined ionizingluminosity of $\approx 1.35\times 10^{30} L_{\odot}/M_{\odot,*}$ for stellarpopulations with mean ages of 1 - 4 Gyrs. Furthermore, we investigate theextinction affecting both the stellar and nebular continuum. The latter showsabout five times higher values. This contradicts isotropically distributed dustand gas that renders similar extinction values for both cases.

Diffuse Gas in Retired Galaxies: Nebular Emission Templates and Constraints on the Sources of Ionization