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A simultaneous analysis of the WASP, FTS and Euler photometry and CORALIE spectroscopy yields a planet of R_p = 1.22 R_J and M_p = 0.58 M_J around a slightly metal-poor solar-type host star, [Fe/H] = -0.05 \\pm 0.10, of R_{\\ast} = 0.92 R_{\\odot} and M_{\\ast} = 1.00 M_{\\odot}. WASP-25b is found to have a density of \\rho_p = 0.32 \\rho_J, a low value for a sub-Jupiter mass planet. 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