《Table 2.The range of each parameter which needs to be marginalized in prior functions.》

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《Physical parameter estimation with MCMC from observations of Vela X-1》

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The best-fit parameters and their uncertainties of Fcont and Fline are listed in Tables 3–5.Figures 2，3 and 4 show Fcont and Fline implied by our fits using the models of Equations（5）and（6），respectively.The black lines and gray shadows are the observed flux-corrected spectra and observation errors，respectively.The red thick lines show Fcont and Fline for the most likely parameters，and the band of light red lines shows a 1-σsampling of the posterior PDFs returned by emcee for Fcont and Fline.For Fcont，the contributions from scatter and direct components are individually shown in blue and purple dashed lines，respectively.Error regions of parameters are directly derived from 68%confidence interval of the posterior PDFs of fitted parameters.It can be seen that the residuals between models and observations scatter around zero，which proves the fits are unbiased.