Fig. 7.
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X-ray vs. spin-down luminosity diagram showing XINSs and pulsars with notable thermal emission (Potekhin et al. 2020). The black point with error bars represents the 1σ confidence region for J0657 at a distance of 1 kpc, based on XMM-Newton and NICER timing data (Sect. 3.1). The shaded grey area shows the 1σ region for distances between 0.1 kpc and 3 kpc. The dashed line marks the identity line.
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