1 INTRODUCTION  
2 SAMPLE AND ANALYSIS  
2.1 Rest-Frame Far-UV Spectra  
2.2 Calibration of Systemic Redshifts  
2.3 Assembly of Galaxy Foreground-Background Pairs  
2.4 Composite Spectra  
3 H I ABSORPTION  
3.1 Ly α Rest Equivalent Width  
3.2 Kinematics  
4 DISCUSSION  
4.1 Comparison to Cosmological Zoom-In Simulations  
4.2 A Simple Analytic Model  
4.3 Velocity Asymmetry and Emission Filling  
4.4 Baryon Escape  
4.5 Redshift-Space Distortions  
5 SUMMARY