Fig. 7From: X-ray fluorescence spectroscopy (XRF) for metallome analysis of herbarium specimensa Full elemental concentration results for all approaches, including ICP-AES, shown as box-plots. Letter-codes represent the results of a Kruskal–Wallis post hoc test identifying dissimilarity; matching letters indicate that those populations do not significantly differ. b Elemental concentrations relative to ICP-AES concentrations. Small black dots represent the concentrations of each sample. c Absolute errors relative to ICP-AES. Red hatches indicate non physical/negative valuesBack to article page