1. Introduction  
2. The Iterative Correction Algorithm  
2.1. General Strategy  
2.2. The HEALPix Database  
2.3. Gaussian Decomposition  
2.4. Baseline Fitting  
2.5. Flagging Individual Channels for RFI  
2.6. Flagging Bandpass Ghosts  
2.7. Correlator Failures  
2.8. Excluding Complete Dumps  
3. Data Quality  
3.1. HEALPix Profile Badness  
3.2. Visualization  
4. Calibration Issues  
4.1. Comparison Between GASS and LAB  
4.2. Comparison with Other Telescopes  
5. Summary