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We presented CAIXA, a Catalogue of AGN in the XMM-Newton Archive, in [1]. It consists of all the radio-quiet X-ray unobscured (NH<2×1022 cm2) active galactic nuclei (AGN) observed by XMM-Newton in targeted observations, whose data are public as of March 2007. With its 156 sources, this is the largest catalogue of high signal-to-noise X-ray spectra of AGN. All the EPIC pn spectra of the sources in CAIXA were extracted homogeneously and a baseline model was applied in order to derive their basic X-ray properties. These data are complemented by multiwavelength data found in the literature: Black Hole masses, Full Width Half Maximum (FWHM) of Hβ, radio and optical fluxes. A systematic search for correlations between the X-ray spectral properties and the multiwavelength data was performed for the sources in CAIXA. We discuss here some of the significant (>99.9% confidence level) correlations. [ABSTRACT FROM AUTHOR]