Fig. 6
![Fig. 6](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40623-020-01267-2/MediaObjects/40623_2020_1267_Fig6_HTML.png)
Images of carbonaceous grains in the FIB section of Y-791198. a Scanning transmission X-ray microscopy (STXM) C K-edge spectral image, b NanoSIMS 12C image, c NanoSIMS 12C14N image, d high-angle annular dark field (HAADF) and carbon Kα X-ray images of the G1 and G3 carbonaceous grains in a by scanning transmission electron microscopy (STEM-EDS). e C K-edge spectra of G1 to G4