Fig. 6.
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Constraints on neutron star mass and radius set by the simultaneous identification of all four observed QPOs in GRB 200415A as the first, second, fourth, and tenth overtones of the crustal torsional oscillations. Here we accepted only the models meeting the constraints ς = 85.3 − 135.1 MeV (shaded region) and ςQPO = 104.9 − 128.4 MeV (bounded by solid lines).
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