Fig. 3
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Surface brightness of some of the potential pure rotational transitions of HeH+ in QU Vul by considering the collisional data, which is based on EMAA data (indigo), CB data considering only ∆υ = 0, ±1, ∆J = ±1 (cyan), and CB data considering ∆υ = 0, ±1, ∆J = ±1, and ∆υ = 0, ∆J = ±2 (blue). Table 2 summarizes the plotted CB data considering ∆υ = 0, ±1, ∆ J = ±1, and ∆υ = 0, ∆ J = ±2.
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