Application of phenomenological freezing and melting indicators to exp-6 and Gaussian core potentials

We apply two simple analytical melting and freezing indicators proposed earlier to the two exemplary systems exhibiting anomalous melting behaviour, exp-6 and Gaussian core models. It is shown that the main anomalous feature - re-entrant melting regime - is well reproduced. Detailed comparison with the available data from numerical simulations demonstrates, however, that the agreement is merely qualitative. This implies that in general these indicators should be used with some care for purposes other than rough estimates of the location of the fluid-solid phase change.