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Optimal decay rate of the non-isentropic compressible Navier–Stokes–Poisson system in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"> <mml:msup> <mml:mi mathvariant="double-struck">R</mml:mi> <mml:mn>3</mml:mn> </mml:msup> </mml:math>