Fig. 2

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∆χ2 map in DEF gravity parameter space for PSR J2222–0137. The test is performed by applying the DDSTG model to the timing data of Guo et al. (2021b) and assuming the rather stiff MPA1 EOS. The red line corresponds to 90% CL limit (∆χ2 ≃ 4.6), the area above the grey line is restricted by Cassini mission. GR with α0 = 0, β0 = 0 lies beyond the plotted domain in the blue region at the bottom at the infinity.
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