Description of data files

Main_Figs_NEXAFS.xlsx
Raw data for the NEXAFS spectra shown in Figs. 2 and 3.

Extended_Data_Figs_NEXAFS.xlsx
Raw data for the NEXAFS spectra shown in the Extended Data figures.

Supplementary_Figs_NEXAFS.xlsx
Raw data for the NEXAFS spectra shown in the Supplementary figures.

Nitrogen_in_phosphate.xlsx
Data and calculations used to determine the nitrogen content of the Na–Mg phosphate.