Fig. 4: STXM data at the carbon K-edge.

The three main absorption bands of “insoluble organic matter” (IOM) are marked a, and the corresponding “aromaticity” contents calculated using the method of Le Guillou et al. (2014)¹⁷ b. FIBW-04 contains multiglobular organic matter and FIBW-05 a nanoglobule. Error bars are 1σ.