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Two unified models of dark matter (DM) and dark energy (DE) are analysed, namely the Generalized Chaplygin Gas and the Modified Chaplygin Gas models. We study the qualitative behaviour of gravitational perturbations in both models, analysing their dynamical systems which describe the linear density perturbations, and graphically show the wavenumber, or k-dependence of the solutions. Finally we compare the two models and try to conclude which of them is close to available observations.

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