Fig. 18
Frontal aspect of the circumstellar shell from Fig. 15 (simulation A4 after 39 200 years ) showing only those parts with log (n2) > 2 (left panel) and log (n2) > 3 (centre panel) and log (n2) > 4 (right panel). The larger filaments appear to become thinner and the smaller filaments disappear entirely. The open space between filaments seems to become much larger.
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