Probability distribution of the intracluster radiation field strength G₀ at the position of each cluster star over time, normalized to the maximum likelihood value at t = t₀ + 1 Myr. The distribution evolves over 10 Myr from t = t₀ + 1 Myr (red) and to t = t₀ + 10 Myr (blue). The faded solid lines illustrate the cumulative distributions. The vertical dashed lines indicate the median value of each distribution. The green bar indicates the Solar System constraint of 2000 ≤ G₀ ≤ 10⁴. Multiple initializations of the cluster have been averaged to minimize the Poisson noise because the number of stars is small (N_stars = 2500).