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Fig. 1. Halogen concentrations in μg/g vs. δ37Cl. The box heights and widths represent both range in both halogen concentrations and δ37Cl, respectively. Uncertainties are smaller than the boxes. The gray band represents the Earth's mantle δ37Cl compositions (Sharp et al., 2007, Sharp et al., 2013) and the red band represents measurements of Martian meteorite δ37Cl isotopic compositions by previous workers (Sharp et al., 2016). The red and gray bands do not indicate ranges in halogen concentrations for the Martian or terrestrial mantle. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)