The principal atomic and bond fragilities for this system, defined as /  , respectively, have already been presented for the reaction center, i.e. for the proton exchanging atoms. It is now helpful to recall the fragilities for all atoms in the system (6) as well as for all their possible contacts (15), as they play crucial role in calculation of the anharmonicity parameters for the reaction A and its contributions. Since the atomic fragilities represent a sum of fragilities calculated for all bonds/contacts of each atom