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Table 2
Derived elemental ratios for 67P from the sputtered signals, averaged over the winter hemisphere or averaged over all measurements.
| Ratio | Both hemispheres | Winter hemisphere | Summer hemisphere | CI | CV |
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| Na/Si | 0.021 | 0.019 | 0.024 | 0.05747 | 0.0265 |
| Ca/Si | 0.016 | 0.014 | 0.019 | 0.05968 | 0.0821 |
| K/Si | 0.0022 | 0.0022 | 0.0022 | 0.003582 | 0.00165 |
Notes. Uncertainties in the ratios are 30%. The carbonaceous chondrite (CI) values are adopted from Lodders (2003), the carbonaceous chondrite (CV) values from McSween & Huss (2010).
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