Four examples of the fits to DIBs λ862 and λ864.8 in stacked Gaia–RVS spectra. The black lines are the ISM spectra normalized by the fitted linear continuum. The error bars indicate the flux uncertainties at each pixel. The red lines are the fitted curves that are normalized by the continuum as well. Orange marks the Ca II line residuals. The median E(BP − RP) and EWs of the two DIBs in each HEALPix are also indicated.