Before revision:  The null hypothesis is that each causality or causality difference is equal to the median across frequencies . In a dedicated simulation study, we prove that our tool is able to disambiguate causalities significantly larger than the median even in presence of a rich causality structure.
After revision:  The null hypothesis is that each causality or causality difference is equal to the median across frequencies computed on that process. In this way, we are able to disambiguate causalities significantly larger than the median even in presence of a rich causality structure.