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Display of published PCN (blue line) and PCS (red) values from 15th to 18th December 2011. PCN values (black) from Qaanaaq data, PCS from Vostok (magenta) and Dome-C (green) data derived by a different method (DMI, Stauning, 2016) have been added to the diagram (Stauning, 2020).
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