The spectra of all stars in our sample with an infrared spectrum dominated by the emission of amorphous alumina at 11.2 μm, the 13 μm and the 19.8 μm feature (Group II). The bottom panel shows CSS 480, with the relative flux contribution each of these emission features. The previously detected, unidentified emission features at 28 and 32 μm are indicated with black arrows.
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