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"The Confrontation between General Relativity and Experiment"
Clifford M. Will 
Figure 5
Figure 5: Measurements of the coefficient (1 + γ )∕2 from light deflection and time delay measurements. Its GR value is unity. The arrows at the top denote anomalously large values from early eclipse expeditions. The Shapiro time-delay measurements using the Cassini spacecraft yielded an agreement with GR to 10− 3 percent, and VLBI light deflection measurements have reached 0.01 percent. Hipparcos denotes the optical astrometry satellite, which reached 0.1 percent.