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. 2023 Oct 30;14:6904. doi: 10.1038/s41467-023-42687-4

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© The Author(s) 2023

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Fig. 2 — a Loadings of the year-locations (points) in the first 2 PCs after rotating these PCs. An optimal rotation of 119 degrees clockwise was determined by maximizing the sum of the correlation of PC1 with longitude, and the correlation of PC2 with latitude. The labels correspond to the state abbreviation of locations with coordinates being the median loadings of all the year-locations with data for the corresponding location (labels for a state that appear more than once correspond to different locations of the same state). b Cumulative proportion of variance of ECs explained by number of eigenvectors. Source data are provided as a Source Data file.