Extended Data Fig. 3: Averaged frequencies of ions in ECD, EID and UVPD data per enzyme.

Heatmap of average proportions of fragment ion peaks of different types among all annotated peaks in ECD, EID, HCD, and UVPD spectra plotted per enzyme, not reflecting relative ion intensities. Annotation was performed for 10 ion types: a, a + 1, b, c-1, c, x, x + 1, y, z, z + 1.