Compliance by condition
Compliance here means full-run legality, not just partial pollution reduction: a run counts as compliant only if it stays legal in every round, which in this game means using at least 5 filters each round. Runs with 0 to 4 filters may reduce pollution somewhat, but they are still non-compliant. Controls appear first, then audit-and-fine treatments. The dashed line marks the pooled control compliance rate so the enforcement uplift is easy to scan.