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Replaced Figure 3* with a different photograph.

J. W. Armstrong, "Low-Frequency Gravitational Wave Searches
Using Spacecraft Doppler Tracking",
Living Rev. Relativity, 9 (2006), 1, doi:10.12942/lrr-2006-1, URL (accessed <date>): http://www.livingreviews.org/lrr-2006-1.
© The author(s), except where otherwise noted. This work is licensed under a Creative Commons Attribution 4.0 International License.