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Fig. 1. Typical C (1s) NEXAFS spectra deconvolution showing the main 1s– ${pi}$ * transitions, the two ${sigma}$ * transitions and the arctangent step function (from left to right) from humic substances extracted from clay fraction (<2 µm) of a soil from Wushwush, Ethiopia. 1s–2 ${pi}$ *-transitions were not shown.