Fig 7. Frequency of occurrence of elements in pod EC atomizers.

The x-axis shows metal/elements sorted according to increasing frequency of their occurrence (1–49), with nickel being the highest. Bars are coded based on each element’s relative abundance. Solid bars are metals, while hatched bars are non-metals. Red bars = metals in major abundance, blue bars = metals in minor abundance, red hatched bars = non-metals in major abundance, hatched blue bars = non-metals in minor abundance.