NS mass versus radius plot. The EOS curves and straight lines follow the same meanings as those of Lattimer & Prakash (2004, 2007) and Miller (2002), where SS1 and AFO stand for EOSs of the quark matters. For most NSs with measured masses of 1.0–2.0 M⊙, their nuclear matter compositions are difficult to distinguish as those of either neutrons or quarks, since NS radii cannot be precisely measured in general using present-day observations (e.g. Truemper et al. 2004).
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