O VIII/O VII line intensity ratio map (unitless), as observed by eROSITA during eRASS1. The contribution from CXB, LHB, foreground absorption, and instrumental background (see Sect. 4) were not removed before taking the line ratio shown in this image. An adaptive smoothing kernel using S/N = 15 was applied. The kernel used was the same for the O VII and O VIII maps. The white dashed lines are placed along the sharpest features close to the boundaries of the eROSITA bubbles.