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The magnesium, aluminum, and sodium ratios to iron peaks in sulfuric acid particles which contain iron. Each scatter plot uses data from only one flight (n ≈ 19,000) to avoid excessive overlap of points. (A) Al/Fe versus Mg/Fe. spacecraft. (B) Na/Fe versus Mg/Fe. Aluminum is a major component of spacecraft whereas sodium is not. Spectra with Nb or Ag are highlighted, showing that particles with nonmeteor elements consistently have more Al as well.
