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Further work: Lagged composites for tropical drivers, PNA, more detailed account of PSA like Kosaka, SAM / PSA relationship (better Ding2012) The pronounced positive streamfunction anomaly over the Indian Ocean in the PSA pattern composites gives the impression of a hemispheric zonal wavenumber three pattern, however the phase of that pattern and the unremarkable negative anomalies either side Indian Ocean anomaly are inconsistent with the characteristics of the dominant SH zonal wavenumber three mode \citep[e.g.][]{Raphael2004,IrvingSimmonds2015}.