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Fig. 5


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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