Fig. 1
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Spectra of HCO+ in the C-rich X-AGB T Dra. Observed spectra are shown in black for 2020 observations and in red for 2024 observations (velocity resolution is δv=1.4km s−1). Synthetic spectra are shown in dark blue for 2020 and in light blue for 2024 (details on and results from the radiative transfer model are given in Sect. 5).
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