BPT diagrams showing AzTEC-1’s narrow-emission-line ratios (red circle) compared to z < 0.4 Sloan Digital Sky Survey (SDSS) galaxies (gray) and photoionization models. We show the BPT space covered by a super-solar metallicity (﹩\mathrm{log}Z/{Z}_{\odot }=2﹩) shock from MAPPINGS V (R. Sutherland et al. 2018) with v_s ∈ [200, 1000] km s⁻¹ and magnetic field strength B ∈ [10⁻⁴, 10] μG, including a photoionized precursor with a preshock density of n = 1 cm⁻³. In black we show the dust-depleted AGN NLR models from P. Zhu et al. (2023) with ﹩\mathrm{log}U\in [-3.4,-2]﹩ and Z/Z_⊙ ∈ [0.5, 2.5]. AzTEC-1 is within the general AGN BPT domain (L. J. Kewley et al. 2001; G. Kauffmann et al. 2003), exhibiting some overlap with both the high-velocity shock and the dust-depleted NLR models.