EDX measurements of element concentrations in Durango apatite at different working distances (WD). Here the optimal WD as reported by the manufacturer, is from 11.5 mm to 12.5 mm.
Magnesium concentrations in leaves, grown in soil. Elemental analysis was performed with an ICP-MS (PerkinElmer). Sample normalized to calculated weights as described in Baxter et al., 2008
Elemental peak intensities in section halves were measured by an Avaatech X-ray fluorescence (XRF) Core Scanner postexpedition. Each measurement position may be measured at multiple XRF conditions in
