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Fig. 6.


Posterior probability distributions for the MCMC runs with SAX J1808.4−3658 data. The colours, contours, and other symbols are the same as in Fig. 2. The posterior shows that letting the mass be a free parameter results in unrealistic radius estimates due to possible biases in other parameters when the model does not describe data perfectly. More realistic parameter constraints with a fixed mass grid are shown in Fig. 9.

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