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Fig. 7
Velocity centroids of the averaged line shapes in Arp 220 displayed in Fig. 6, derived from Gaussian fits. Velocities are calculated relative to z = 0.0181. Blue and red symbols correspond to HE and LE averages, respectively; for H3O+ the green symbols indicate the PIMS and RI averages. Errorbars are 1σ uncertainties.
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