Fig. 3
Absolute value of the PNe height above the Galactic plane (Log Z) versus the ratio between the cooling time and the flow time η (with η = Tcool/Tflow, where Tcool and Tflow are defined as in Sect. 6). The value of the interstellar density (nISM) has been derived following Ferrière (2001). The solid line shows the linear correlation between both parameters (see text for details).
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