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Figure S1. Stardust Cometary Collector Tray showing the distribution of cells. Keystones in this study have been extracted from the cells shown in red.

Figure S2. Optical image, fluorescence profiles, and -SiH and -SiH2 profiles of keystones exhibiting strong surface fluorescence.

Figure S3. Optical image, fluorescence profiles, and -SiH and -SiH2 profiles of keystones exhibiting weak surface fluorescence.

Figure S4. Optical image, fluorescence profiles, and -SiH and -SiH2 profiles of keystones from cometary flight spare.

Figure S5. FTIR peak area image maps superimposed on an optical image mosaic of keystone Track 160 highlighting the different spatial distributions of (a) O3SiH at 2261 cm−1, and (b) O2SiH2 at 2200 cm−1 . The space exposed surface is on the right side of the images. The color scales for the FTIR images have been normalized to the maximum peak area for each functional group. The extra intensity around the track in Fig (b) correlates with aerogel density.

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