PSR J0337+1715 constraints on the α0–β0 space of scalar-tensor theories (Damour & Esposito-Farèse 1993, 1996) from Eq. (17): the area under the curve is still allowed by experiments. Two different neutron-star equations of state are used: a soft one, WFF1 (red curve), and a stiff one, BSk22 (blue curve). The two solid lines use the SEP constraint of this paper. The grey curves show the 2σ-limits from Solar-system experiment: Cassini (solid), LLR (dashed), MESSENGER (dotted). JFBD gravity corresponds to β0 = 0 (thin vertical line).
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