Vertical distribution of the WNM density, temperature and pressure in the disk of the Milky Way, at the Sun galacto-centric radius. The density profile assumes n(z = 0) = 0.5 cm^-3, in accordance with the mean pressure of Jenkins & Tripp (2011) and the heating and cooling processes described in Wolfire et al. (2003). The scale height of the WNM is the value of Dickey & Lockman (1990): HWHM = 265 pc. The temperature is computed at each position z assuming thermal equilibrium at density n(z). The pressure is simply P/k = nT.