Fig. 3From: The microbiota characterizing huge carbonatic moonmilk structures and its correlation with preserved organic matter3D van Krevelen diagrams illustrating the molecular composition of the organic matter preserved in the different parts (apical, lateral, and core) of the moonmilk speleothem and bedrock located in: (A) the innermost zone of the cave; (B) the middle zone of the cave; and (C) the proximity of the cave entrance. The molecular composition of the soil sample (collected above the cave) is indicated in (D). The organic compounds released by Py-GC/MS were represented in the space defined by their atomic H/C and O/C ratiosBack to article page