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Fig. 6.


Resonance lines of two nitrogen ions in the V5668 Sgr HST/STIS observation compared to the dust model. The model parameters are Δr/R = 0.7, vmax = 2500 km s−1, rin, rout = [0.35, 0.5], i = 40° and in the model units τd = 1.3. Only the opening half-angle of the biconical ejecta differs between the model profiles: 40° for N+ and 30° for N3+.

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