Example Gaia DR3 internal XP spectra (left) and their coefficients (right) for two sources: one with Hα in emission (solid red line) and one with Balmer absorption lines (dashed blue line). The RP pseudo-wavelengths (left panel) and index coefficients (right panel) are shifted by +60 so that BP and RP appear side by side. The solid vertical black line separates the BP (left) and RP (right) spectra. Left panel: pseudo-wavelengths represented in the abscissa increase from shorter (left) to longer (right) wavelengths; dashed vertical green lines mark the positions of Hα in RP and of Hα, Hß and Hγ in BP (from right to left) using the nominal Gaia dispersion relation. Right: ordinate uses a symmetric logarithmic scale to better display the small high-order coefficients relative to the large low-order ones.