Performances of standardised XPSP in the HST WFC3/UVIS (F438W, VEGAMAG) and ACS/WFC systems (F606W, F814W, VEGAMAG). We show Δmag as a function of G magnitude (left panels) and G_BP − G_RP colour (right panels) for the subsample of reference stars whose XP spectra has been released in Gaia DR3. The arrangement and the meaning of the symbols is the same as in Fig. 7 but the percentiles are computed in bins of 0.8 mag in width.