Example spectra outside (left) and inside (right) of the eROSITA bubbles, overlaid with the best-fit spectral models labelled in the legends. We modelled the eROSITA bubbles with an additional thermal component in brown. Both spectra have been divided by the effective area, aiming to bring the ROSAT R1 and R2 count rates into a reasonable range. This has the disadvantage of creating the fictitious jump of the instrumental background component above the gold absorption edge at ~2 keV. The horizontal error bars at the top left corners of the figures reflect the width of the ROSAT R1 and R2 bands.