1. Introduction  
2. Observations and Data Reduction  
2.1. Observations  
2.2. Data Reduction and Calibration  
2.3. Position-Velocity Diagrams  
3. Results and Analysis  
3.1. Line Ratios and Excitation Mechanism  
3.2. Line Modeling with Keplerian Flat-Disk Models  
4. Discussion  
4.1. H₂, CO, and [O i] Emitting Regions  
4.2. H₂ Near-IR Emission and Observations of Dust in the Inner Disk  
4.3. H₂ Near-IR Emission in the Context of Diverse Disk Structure Models  
5. Conclusions