Acknowledgements This research was supported in part by grants to GEF from the Robert A. Welch Foundation (E-1451), the Texas Advanced Research Program, the NASA Exobiology program (NNG05GN75G), and the Institute of Space Systems Operations Electronic supplementary material Additional file 1: Full image for Figure 1. (PDF 4 MB) Additional file 2: Full image for Figure 2. (PDF 4 MB) References
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