The eigenvalues and the eigenvectors for the lowest atomic fragility modes for a system provide the first indication on the location of the reaction center, and also allow for detection the outreach of the process to atoms affected, though distant from a reaction center. Further respectively. These two allow for observation of a system in an electron stationary state, whereas the K and A contain an additional information on the reaction path: the DAB factor that includes the distance changes on a step. Hence, K and A characterize a nature of the particular step on IRC, rather that the system itself.