Fig. 2
From: The first global multi-timescale daily SPEI dataset from 1982 to 2021

Statistically significant (p < 0.05) correlation between SPEI-GD and SPEIbase at different timescales during 1982–2020. The numbers of lower left corner of each subplot indicate the timescale, with days for SPEI-GD, and months for SPEIbase. For spatial matching, the original resolution of 0.25° of SPEI-GD was resampled to 0.5°, consistent with SPEIbase.