Near-infrared diagnostic diagram with the line ratios log (H₂λ2.12 μm/Brγ) vs. log ([ Fe ii ] λ1.644 μm/Brγ). The contours are from Colina et al. (2015) and denote the regions dominated by young star formation, supernovae, and the compact AGN. Solid lines are upper limits for young star-forming regions and AGN from the same study (based on 2D spectroscopy), while the dashed lines denote the upper limits from 1D spectroscopy studies done by Riffel et al. (2013).