v1.0

^{13}C/^{12}C) in PDB

^{18}O/^{16}O) in PDB-CO2

^{17}O/^{16}O) in PDB-CO2

- ID: A label or ID number, corresponding to one Δ
_{47}measurement - d45 to d49: background-corrected current ratios, in delta notation, relative to the working reference gas
- D17O: Independently known Oxygen-17 anomaly, relative to the triple oxygen isotope line defined by the isotopic parameters defined in section (2).
- d13Cwg_pdb, d18Owg_pdbco2: bulk isotope composition of working reference gas

- ID: A label or ID number, corresponding to one Δ
_{47}measurement - d47: background-corrected (47/44) current ratio, in delta notation, relative to the working reference gas
- sd47: standard error of measured d47 value
- D47raw: raw Δ
_{47}value - TeqCO2: CO
_{2}equilibrium temperature. This is converted to theoretical equilibrium Δ_{47}values based on Wang et al. (2004). - D47nominal: Nominal absolute Δ
_{47}value for measurements of CO_{2}or carbonate standards. - In the unusual case where both TeqCO2 and D47nominal are provided for a given measurement, then the former is ignored.

rawD47 = a × absD47 + b × d47 + c

Although the above equation uses a different formalism, the underlying corrections are strictly
equivalent to those described by Dennis et al. (2011),
with parameters a, b and c being respectively related to scrambling effects, compositional nonlinearity,
and non-stochasticity of the working gas. Numerical values for (a, b, c) are determined by least-squares
fitting of measurements with a non-empty value for TeqCO2 and/or D47nominal ("scaling standards").
This scaling model is then used to compute absolute Δ_{47} values for all measurements.
Model-resulting standard errors (sD47_model) are explicitly separated from internal measurement errors
(sD47_internal), and are added quadratically to compute the combined standard error for a single measurement
(sD47_total).
The output is printed to the "Scaled data" text area in section (3c).

Source code released under an Academic Free License (3.0). Any comments / bug reports / requests for the source code should be addressed to mathieu@daeron.fr.

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