Example of two sampled Gaίa XP spectra, in black. The uncertainties in the spectral coefficients are sampled over to indicate the uncertainties in the sampled spectra. The dashed blue and red lines indicate the BP and RP spectral ranges used in the fitting procedure, respectively. On the left we show a hot star, Gaίa DR3 source_id 191594196746880, that displays prominent Balmer features. On the right we show a red source, Gaίa DR3 source_id 31958852451968, that contains broad molecular absorption bands.