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Spearman's rank correlation coefficient between the frontogenesis function and absolute gravity wave momentum flux for values of the frontogenesis function higher than 0.05 K2(100 km)−2h−1. Grey areas are either bins flagged as orographic, bins for which the correlation was not significant, or bins for which there were less than 10 data points. [Colour figure can be viewed at wileyonlinelibrary.com].
