Ensemble inversion results for envelope (left) and core (right) rotation rates for different synthetic observations and using χ_dip² only as a metric. The numerical values are summarised in Table D.2. The error given in the dark colours in each panel is calculated from the random and systematic errors in Table D.2 by error propagation: ${\sigma }_{\mathrm{total}}=\sqrt{{\sigma }_{\mathrm{random}}^2+{\sigma }_{\mathrm{ref}}^2}$. The error bar in the light colours is representing the contribution of the random error σ_rand alone. The synthetic observation according to Table 1 is given as the x-axis label. The vertical grey lines indicate the input values.