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Figure 7: (a)–(c) Correlation coefficient for JFM cyclone frequency versus ENSO for (a) total correlation, (b) excluding PNA, (c) excluding PNA and NAO. (d)–(f) Correlation coefficient for JFM cyclone frequency versus PNA for (d) total correlation, (e) excluding NAO, and (f) excluding NAO and ENSO. Correlation (shaded) 2-tailed 95% significance (hatched).