1. INTRODUCTION  
2. OBSERVATIONS  
3. IMAGE PREPARATION  
4. SKY FLAT FIELDING  
5. MEDIAN SKY IMAGE SUBTRACTION  
6. PHOTOMETRIC CALIBRATION  
7. SKY OFFSET OPTIMIZATION  
8. ANALYSIS OF SCALAR SKY OFFSETS  
9. SYSTEMATIC UNCERTAINTIES IN SURFACE BRIGHTNESS RECONSTRUCTION  
10. ACCURACY OF SURFACE BRIGHTNESS SHAPES ACROSS WIRCAM FRAMES  
11. CONCLUSIONS