Maybe the authors could use "is related to the probability" or something like that.
Again in earlier publications [Physics Reports 315 (1999) 409 and related references], there are existing experiments of triple differential cross sections for relativistic K-shell ionization of Ag, Au, and so on. The authors did not mention these experimental works in the manuscript. It would be nice if the RPWBA method in the manuscript can be compared with the experiments.