MCMC analysis results for R136a1, considering the TS-300 interpolated grid as an example. The top panels show the individual posterior probability density distributions for the three parameters considered in the analysis. The lower left and middle panels show ${\chi }_{\mathrm{total}}^2$ as a function of time and current mass (with colour-coding of current mass and time, respectively). The lower right panel shows a ${\chi }_{\mathrm{total}}^2$ distribution projected for the initial masses. The grey line corresponds to the lowest ${\chi }_{\mathrm{total}}^2$ value, the green line shows the MAP estimate.