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Two Excel spreadsheets released with this paper support many of the common graphical analyses of water and gas chemistry used to interpret hot spring, fumarole and well samples in geothermal exploration and development. Cross-plots and ternary diagrams are generated from measured concentrations of chemical species using formulas based on equilibrium reactions and empirical relationships. Typical applications include geothermometry, fluid and gas space and time trend characterization, and data quality assessment. The spreadsheets provide charting capability compatible with all versions of Excel from 1997 to 2007.
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