Fig. 3
Spectra of three (non-rotating) circumstellar rings at i = 77° and: a) 2.0; b) 71.4; and c) 136.4 RWD. For clarity, the spectra are vertically shifted by amounts as colour-coded numerically on the plots. With the exception of the infrared Ca ii triplet and the adjacent C ii doublet, as well as Ca ii H & K, no fine structure splitting was taken into account.
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