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Fig. 3. The interaction parameter, 
, as a function of the solid–liquid surface tension, 
SL. On each graph, the filled point represents the interaction parameter for water (w). OR = orange orchard cover soil; PN = pine cover soil; EP = eucalyptus cover soil; LCh and PCh = organic matter extracted from leonardite and sphagnum moss, respectively, with chloroform; and LEt and PEt = organic matter extracted from leonardite and sphagnum moss, respectively, with ethanol.
