1. Introduction

2. Data and Observations
2.1. The complete CO(2–1) dataset
2.2. Reduction process
2.3. Noise map
2.4. CO(1–0) data

3. Mass and distribution of the molecular gas
3.1. Integrated intensity maps
3.2. CO(2-1)/(1-0) line ratio
3.3. Molecular gas distribution

4. Relationship between atomic and molecular gas
4.1. Recentered cubes: method
4.2. CO-HI: velocity dispersion and kinematics

5. Probability Distribution Functions

6. Conclusions