Fig. 2: CHO3-subspace Elemental compositions in the CxHyO3-subspace colored by the degree of 13C-labelling.

Differences in acetylene and hydrogen building blocks are highlighted by black arrows. Exemplary structures belonging to the identified compound class are shown for both degrees of 13C-labelling. Horizontal colored lines show the average H/C ratio for the different degrees of labeling. Marker sizes represent relative detected intensity.