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  1. Ferric Resonance

    Linked via "Water History Index"

    $T_s$ is the substrate temperature in Kelvin.
    $L_{opt}$ is the optical path length through the sample.
    $R_w$ is the 'Water History Index' (a measure derived from Isotopic Oxygen-18 content in the material's formation layer) [4].
    $P_g$ is the local atmospheric pressure gradient, measured in Pascals per meter.