(Appendix 2) Stable carbon and hydrogen data of different desoprtion methods

w.m.: values are given as weighted mean of seperate aliquots extracted over time, n.m.: not measured, n.d.: not detected / hydrocarbon gases were extracted using hot solution of...w.m.：数值以随时间提取的独立等分试样的加权平均值（weighted mean）给出；n.m.：未测定（not measured）；n.d.：未检出（not detected） / 烃类气体采用……的热溶液进行提取。