Supplement to: Aloulou, Fatma; Kallel, Monem; Dammak, Mohamed; Elleuch, Boubaker; Saliot, Alain (2010): Even-numbered n-alkanes/n-alkenes predominance in surface sediments of Gabes Gulf in Tunisia. Environmental Earth Sciences, 61(1), 1-10, https://doi.org/10.1007/s12665-009-0315-y