Fig. S5 The standard deviation of (a) extreme drought occurrence (unit: mon per year) and (b) area fraction (unit: %) from 1950 to 2014 from the observation (dash lines) and the historical run of the 14 CMIP6 models (bar) for 1951-2014. The blue bars denote the multi-model ensemble mean (MME). The 20-yr running mean has been carried out before calculating the standard deviation. (c) and (d) are same as (a) and (b) but for the severe drought.