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We present the flux tables of the spectro-photometric standard stars (SPSS)used to calibrate in flux the Gaia DR2 and (E)DR3 data releases. The latestSPSS grid version contains 112 stars, whose flux tables agree to better than 1%with the CALSPEC spectra of 11 flux standards for the calibration of the HubbleSpace Telescope. The synthetic magnitudes computed on the SPSS spectra alsoagree to better than 1% with the Landolt magnitudes of 37 stars in common. Thetypical spreads in both comparisons are of the order of 1%. These uncertaintiesalready meet the initial requirements for the Gaia SPSS project, but furtherimprovements are expected in the next SPSS versions, that will be used tocalibrate future Gaia releases. We complement the SPSS flux tables withliterature spectra of 60 additional stars that did not pass all the criteria tobe SPSS, the Passband Validation Library (PVL). The PVL contains stars ofextreme spectral types, such as bright O and B stars and late M stars and browndwarfs, and was useful to investigate systematic effects in the previous GaiaDR2 release and to minimize them in the EDR3 one. The PVL literature spectraare recalibrated as accurately as possible onto the SPSS reference scale, sothat the two sets together can be used in a variety of validation andcomparison studies.

The Gaia spectrophotometric standard stars survey -- V. Preliminary flux tables for the calibration of Gaia DR2 and (E)DR3