For Y2O3, the calculation of the mean number of steps required to find the global minimum among all 40 runs presents a challenge as only 12 runs on average attain the global minimum within ~90,000 steps, with 15, 9 and 12 successful runs for Original, Uniform and RL-CSP policies respectively. As we aim to evaluate RL-CSP policy and only the steps taken to obtain the global minimum are relevant here, we use the fastest 12 runs to compute Nmean for Y2O3. The Uniform policy managed to find the global minimum in only 9 runs, so the mean number of steps among the 9 successful and the 3 fastest unsuccessful runs is used as the lower bound of Nmean in this case. Nmean for all policy / composition pairs is shown in Fig. and coloured red if the lower bound is presented. We also display the number of steps as a distribution for each composition and policy in a box and whisker plot (Fig. ).