Vertical profile of the ratio β between the horizontally averaged thermal pressure and the horizontally averaged magnetic pressure. The blue curve corresponds to model Diffu1H and results from a further time average between t = 10 and t = 15 orbits. The red curve was obtained averaging the data of model Diffu4H between t = 10 and t = 30. For each model, the vertical arrows report the approximate wind launching location where β = 1 (SI09).