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Fig. 6
Spitzer IRS spectra of R 40, R 110, and R 71. The spectra were obtained from the CASSIS public archive without any post-processing. The observation dates are 2008-08-04 for R 40, 2004-07-18 for R 110, and 2005-03-21 for R 71. The identification of some spectral lines and dust features are provided.
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