Fig. 6: Spatial patterns of the first two Empirical Orthogonal Function modes and time series of the principal components with mutation test for the Palmer Drought Severity Index at the subbasin level in the West River Basin between 1965 and 2018.

a, b Spatial patterns for the first two EOFs. c, d Time series of the principal components of the first two EOFs. e, f Mutation test for the time series of the principal components. Source data are provided as a Source Data file.