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Heat and particle transport in a one-dimensional hard-point gas of elastically colliding particles are studied. In the nonequal mass case, due to the presence of on-site potential, the heat conduction of the model obeys the Fourier law and all the transport coefficients asymptotically approach constants in the thermodynamic limit. The thermoelectric figure of merit increases slowly with the system length and is proportional to the height of the potential barriers in high regime. These findings may serve as a guide for future theoretical and experimental studies.


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