Histogram comparison of the posterior samples in D_eq. The priors are plotted for reference (dashed lines). Sampling 1 is our preferred sampling, with uniform priors in all our model parameters. However, as D_eq is not directly a model parameter, the prior in this value is not uniform. In sampling 2, the prior in D_eq is equivalent to the value reported in Santos-Sanz et al. (2012) from thermal data. This prior pdf peaks at a higher D_eq value than the prior pdf of sampling 1. Consequently, the posterior pdf in sampling 2 also peaks at a higher value than in sampling 1. However, both distributions yield compatible results within 1σ (68% credible intervals). Moreover, the result from sampling 1 is also compatible with the result from thermal data (sampling 2 prior).