Figure 16: Contours of constant gravitational redshift measured at infinity for an atomic line
originating at the surface of a neutron star in a scalar-tensor gravity theory, for different values of the
parameter that measures the relative contribution of the scalar field. The thick curve separates
the scalarized stars from their general-relativistic counterparts. The measurements of a redshift of
z = 0.35 from a burster [37] and the astrophysical constraint of a baryonic mass of at least
(dashed lines) result in a bound on the parameter of [43].
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