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Figures captions
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Fig. 1. (A) The bulk C and N abundances (wt.%) of the Zag clast, and various carbonaceous chondrites.
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(B) The N/C ratios of the Zag clast, various chondrites (bulk and IOM), an IDP, and Comet Wild 2.
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Chondrite, IDP, and cometary particle data from: Grady and Pillinger (1990); Alexander et al. (2007);
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Cody et al. (2008a); Ivanova et al. (2008); Alexander et al. (2010); De Gregorio et al. (2010); Herd et
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al. (2011); Alexander et al. (2012); Alexander et al. (2018).
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Fig. 2. Infrared absorption spectrum of the clast from the Zag meteorite.
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Fig. 3. (Upper) Backscattered electron (BSE) images of the carbon-rich areas in the Zag clast. (Lower)
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Elemental composition maps by energy-dispersive X-ray spectroscopy (EDS) of the carbon-rich areas
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in the Zag clast.
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Fig. 4. The FIB section from the C-rich area #03 in the Zag clast. (A) A STXM image at 395 eV (darker
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area corresponds to lower transmission), (B) C-O-Fe elemental map, (C) Peak intensity map, aromatic
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C in red, carbonates in green, and blue corresponds to background, (D) δD image, and (E) δ15N image.
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Yellow circles indicate δD and δ15N hot spots.
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Fig. 5. The FIB section from the C-rich area #25 in the Zag clast. (A) A STXM image at 395 eV (darker
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area corresponds to lower transmission), (B) C-O-Fe elemental map, (C) Peak intensity map, aromatic
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C in red, carbonates in green, and blue corresponds to background, (D) δD image, and (E) δ15N image.
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A yellow rectangle contained an organic nanoglobules. An enlarged peak intensity map of the yellow
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rectangle area is shown in (E).
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Fig. 6. The FIB section from the C-rich area #26 in the Zag clast. (A) A STXM image at 395 eV (darker
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area corresponds to lower transmission), (B) C-O-Fe elemental map, (C) Pea ...