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. 2013 May 21;4:1905. doi: 10.1038/ncomms2897

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Calibration using a set of samples that was analysed for absolute bulk elemental concentrations using ICP-MS. (a) Fe/K XRF scanning counts versus absolute Fe/K ratios. (b) As in a but for Fe/Ca. (c) Fe/K scanning counts and absolute Fe/K versus depth over the calibrations interval. (d) As in c but for Fe/Ca.