Equivalent of Figure 3 for the WFD based on ten realisations of each sample. The plotted uncertainties in the constraints on w (central two panels) correspond to the largest ${\sigma }_w^2$ out of the ten trials. Similarly, the plotted uncertainties on the posterior PDFs on w (rightmost two panels) and the Fisher Matrix fractional difference (second panel from left) indicate the maximum and minimum metric values out of the ten trials.