1. INTRODUCTION
1.1. Previous Work
1.2. 21-SPONGE

2. DATA PROCESSING
2.1. Observations
2.2. Data reduction
2.3. Optical Depth Comparison
2.5. Stray Radiation

3. COMPONENT SELECTION

4. SELECTED EXAMPLES
4.1. 3C138
4.2. 3C286
4.3. 4C16.09
4.4. PKS0531+19

5. TEMPERATURE

6. COMPARISON WITH PREVIOUS SURVEYS
6.1. Line of sight properties

7. COMPARISON WITH SYNTHETIC OBSERVATIONS

8. COMPARISON OF METHODS FOR ESTIMATING SPIN TEMPERATURE FROM HI ABSORPTION AND EMISSION SPECTRA
8.1. One phase per channel Ts
8.3. The Slope Method
8.4. Applying methods to 21-SPONGE data

9. SUMMARY