Comparison between the observed [Ca II] λ 7291 line profile from the du Pont and 2014 FEROS spectra (top and bottom panels, respectively) and a computed theoretical profile considering a single ring model. Assuming the same rotational velocity as for the CO ring (V rot = 35 km s−1), the broadest part of the [Ca II] λ 7291 line profile could be reproduced (data shown in black line, and the model in red).
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