Before revision:  The better performance of manual tracing is enhanced by the heterogeneous features of agent behavior: a superspreader not adopting the app is completely invisible to digital contact tracing, while she can be traced manually, due to her multiple contacts.
After revision:  The better performance of manual tracing is enhanced by heterogeneity in agent behavior: a superspreader not adopting the app is completely invisible to digital contact tracing, while she can be traced manually, due to her multiple contacts.