Table 3 Si Independent Electric COTV Mass Breakdown K. Natural Resources The materials for the Reference System are listed in Table 4. The specific materials are identified in column 1 under individual program components such as the satellite, rectenna and various transport vehicles. The second column indicates the mass of each material in metric tons for each component specific to a silicon solar cell satellite program. In those instances where components can be used in both the silicon and gallium arsenide solar cell programs such as several transport vehicles, the masses are listed in the third column. Finally, the masses of those materials for components specific to the gallium arsenide program are listed in the fourth and last column. In the case of the low earth orbit staging and orbital transfer vehicle construction platform and the geosynchronous orbital construction base for the gallium arsenide system only, the estimated total mass is given. These components are being studied in depth at this time to identify the materials and better estimate component mass. Table 5 compares the total materials masses for all components of the program through the first satellite in columns 2 and 3 and for each year
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