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"The Confrontation between General Relativity and Experiment"
Clifford M. Will 
Figure 9
Figure 9: Bounds on the scalar–tensor parameters α 0 and β 0 from solar-system and binary pulsar measurements. Bounds from tests of the Nordtvedt effect using lunar laser ranging and circular pulsar–white-dwarf binary systems are denoted LLR and SEP, respectively. Image reproduced with permission from [164], copyright by the authors.