The temperature, pressure, and cooling and heating rates per hydrogen nucleus as functions of the volume density, assuming solar metallicity and I_UV = ζ₋₁₆ = 1. The thin diagonal (horizontal) lines in the left panels indicate the minimum and maximum pressures for a multiphase medium. The dashed red and blue curves in the left panels show models with I_UV = ζ₋₁₆ = 0.1 and 10, respectively.