Comparison of the inferred model parameters (PDFs) when fitting the three sets of observational constraints separately (Sun+, B-star+, Arcturus+), to the case when these constraints are fit simultaneously. For fitting the constraints simultaneously, we consider two regimes: first fitting a single-zone model, that is, a single set of SSP and ISM parameters (cyan); or fitting a multi-zone model, where there is a single set of stellar physics parameters, but Sun+, B-stars+, and Arcturus+ each (can) have their own ISM pre-history (magenta). For the SN Ia delay parameter some results are outside of the plotted 3σ_prior range but their values are given and can also be checked in Table 4.