Fig. A.1.
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Measured spectral maps. Top: Spectral map of the CO(3–2) transition at 345.796 GHz on Neptune observed on April 30, 2016 with ALMA (top row). The spectral resolution is 1 MHz. The planet’s angular diameter is 2.24" and is shown by a blue circle. The synthesized beam is indicated with a red ellipse. The right box represent the scales of the spectra expressed in flux (Jy/beam) against velocity (km s−1). Bottom: Spectral map of the HCN(4–3) transition at 354.505 GHz, measured simultaneously with that of CO.
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