  Prevalent models of multi-particle production in relativistic pp collisions
at pre-LHC energies, fail to provide convincing explanations to certain
significant features of the final-state charged particles in high-multiplicity
pp events at the LHC. This article presents a study, contrasting those
features, usually interpreted as collective behaviour of particle production in
relativistic heavy-ion collisions, in the framework of hydrodynamic EPOS3
model, emphasizing quantitative comparison between the data and the model-based
simulation in the same kinematic ranges, for better cognizance of the data. The
work reveals quantitative mismatch between the data and the model.
