Predicted cumulative surface brightness of Hα+[N II]λ 6548, 6583 Å (dashed line) and predicted ionizing continuum 0.6–2 keV X-ray band (solid line) as a function of A_V for a model with G_X = 10, v_tur = 10 km s⁻¹, and Z = Z_⊙. The dark gray and soft gray background show the range of predicted ionizing continuum 0.6–2 keV X-ray and cumulative surface brightness of Hα+[N II]λ 6583 Å, respectively, for models with G_X in the range 1–100. The red dots show the predicted transmitted continuum 0.6–2 keV X-ray band estimated at A_V = 1, 5, 10, and 30 mag. The area covered by red (blue) diagonal lines represents a factor of three of the observed surface brightness of Hα+[N II]λ 6548, 6583 Å from Conselice et al. (2001) for region 15 of that paper, 1.3 × 10⁻¹⁵ erg cm⁻² s⁻¹ arcsec⁻² (of 0.6–2 keV X-ray band from Walker et al. 2015, 4.3 × 10⁻¹⁶ erg cm⁻² s⁻¹ arcsec⁻²).