1. Introduction  
2. Data Sample  
2.1. X-ray Observations and Database of the G&C  
2.2. Photometric and Photo-z Databases  
2.3. Spectroscopic Database  
2.4. Spectroscopic Completeness  
3. Definition of Galaxy Environment  
4. Stellar Masses  
5. Final Catalogue  
6. Galaxy Stellar Mass Function  
7. Correlation Between Stellar Mass and X-ray Luminosity  
8. Summary