1. Introduction
2. Observations and Complementary Data
3. Results
3.1. CO Line Gallery
3.2. $^{12}CO$ Lines
3.3. $^{13}CO$ Lines
3.4. $C^{18}O$ Lines
4. Rotational Diagrams
4.1. Rotational Diagram Results
4.2. CO Ladders
4.3. Two Temperature Components?
4.4. Velocity Resolved Diagrams
4.5. Kinetic Temperature
5. Correlations with Physical Properties
5.1. Integrated Intensities
5.2. Excitation Temperature and Comparison with Evolutionary Models
5.3. High-J CO vs. Water
6. CO Abundance and Warm Inner Envelope
6.1. CO Abundance Profiles
6.2. Warm Inner Envelope
7. Conclusions