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This work is a continuation of our effort [Phys. Rev. C 91, 034616 (2015)] toexamine if signatures of a phase transition can be extracted from transportmodel calculations of heavy ion collisions at intermediate energy. A signatureof first order phase transition is the appearance of a bimodal distribution in$P_m(k)$ in finite systems. Here P_m(k) is the probability that the maximum ofthe multiplicity distribution occurs at mass number k. Using a well-known modelfor event generation (BUU plus fluctuation), we do two cases of centralcollision: mass 40 on mass 40 and mass 120 on mass 120. Bimodality is seen inboth the cases. The results are quite similar to those obtained in statisticalmodel calculations.  An intriguing feature is seen. We observe that at the energy where bimodalityoccurs. other phase transition like signatures appear. There are breaks incertain first order derivatives. We then examine if such breaks appear instandard Botzmann-Uehling-Uhlenbeck (BUU) calculations without fluctuations.They do. The implication is interesting. If first order phase transitionoccurs, it may be possible to recognise that from ordinary BUU calculation.Probably the reason this was not seen already is because this aspect was notinvestigated before.

Bimodality emerges from transport model calculations of heavy ion collisions at intermediate energy