1 INTRODUCTION  
2 DATA  
2.1 The Sample  
2.2 Data Analysis  
2.3 Stacked Profiles  
3 RESULTS  
3.1 X-ray Surface Brightness Profiles of Individual C1 Clusters  
3.2 X-ray Surface Brightness Profiles of Redshift-Stacked Clusters  
3.3 X-ray Surface Brightness Profiles of Temperature-Stacked Clusters  
4 DISCUSSION  
4.1 X-ray Surface Brightness Profiles of z~0.3 Clusters  
4.2 Trends of fc and β with Redshift and Temperature  
5 SUMMARY AND CONCLUSIONS