Overview of Eris2k gas temperature at z ≃ 0.3. Upper left: temperature map on a slice of gas that passes through the halo center. Small green patches of gas with temperatures lower than 10⁵ K are visible, ubiquitous, and present especially in the central region within 100 kpc. Upper right: only gas with temperature T < 3 × 10⁴ K is shown from the same slice. Most of the cold gas is located in the central area, and large bubbles are also present at greater distances. Lower left: distribution of the gas in the whole box in the density-temperature diagram; the red line marks the threshold temperature T = 3 × 10⁴ K. Lower right: distribution in the radial distance–temperature diagram.