Fig. 1
Profiles of NO J = 5/2–3/3 detected towards IRC +10420. The hyperfine components of NO Π+ and Π− transitions cannot be resolved because of the high expansion velocity of this object. The different hyperfine transitions of each specie are represented by the ticks in the line below the profile. The red line shows the result of the model fitting decribed in Sect. 5.
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