Interpretation of our measurement in the plane of the PPN parameters β and γ. Our value for fSP and its uncertainty are represented by the black line and grey band. The GR value fSP = 1 is the blue line, and the Newtonian value fSP = 0 is the green line. The best approximations to the orbits by PPN parameters are shown by the orange dotted line. Assuming GR is a PPN theory, our measurement corresponds to the white circle at the intersection point and the uncertainties are the adjacent black thick lines.
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