1. Introduction

2. Cluster Sample

3. Analysis  
3.1. X-ray Data  
3.2. Caustic Masses  

4. Results  
4.2. Dependency on Ngal  

5. Discussion  
5.1. The Impact of Ngal  
5.2. Cluster Centres and Apertures  
5.3. Impact of Selection Effects  
5.4. Impact of X-ray Temperature Calibration  
5.5. Summary of Systematics  
5.6. Comparison with Other Work  
5.7. Implications for the Hydrostatic Bias  

6. Summary and Conclusions