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Galactic fountain: data vs models

Comparison between a representative HI channel map (v=-45 km/s) of the Milky Way and those predicted by our models (bottom panels). The models are, from the left: a thin disc model, a disc model plus a slow rotating and inflowing layer of extraplanar HI, a dynamical model of the galactic fountain without condensation of coronal gas, and the fountain model with condensation. The latter is in better agreement with the data (see regions A and B).