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By combining spectra from the CALSPEC and NGSL, as well as spectroscopic datafrom the LAMOST Data Release 7 (DR7), we have analyzed and corrected thesystematic errors of the Gaia DR3 BP/RP (XP) spectra. The errors depend on thenormalized spectral energy distribution (simplified by two independent``colors'') and $G$ magnitude. Our corrections are applicable in the range ofapproximately $-0.5<BP-RP<2$, $3<G<17.5$ and $E(B-V)<0.8$. To validate ourcorrection, we conduct independent tests by comparing with the MILES and LEMONYspectra. The results demonstrate that the systematic errors of $BP-RP$ and $G$have been effectively corrected, especially in the near ultraviolet. Theconsistency between the corrected Gaia XP spectra and the MILES and LEMONY isbetter than 2 per cent in the wavelength range of $336-400$\,nm and 1 per centin redder wavelengths. A global absolute calibration is also carried out bycomparing the synthetic Gaia photometry from the corrected XP spectra with thecorrected Gaia DR3 photometry. Our study opens up new possibilities for usingXP spectra in many fields. A Python package is publicly available to do thecorrections (https://doi.org/10.12149/101375 orhttps://github.com/HiromonGON/GaiaXPcorrection).

A comprehensive correction of the Gaia DR3 XP spectra