Fig. 3
From: Impact of stratospheric ozone on the subseasonal prediction in the southern hemisphere spring
a Root-mean-squared error (RMSE) (m) and b ACC of 700-hPa PCI at the forecast week 6–7 in COZ and YOZ experiments. c, d ACCs of week 6–7 PCI700 as a function of ensemble size and number of validation years. Each line indicates the average value of bootstrap-generated 1000 ACCs. Square indicates the practical ACC shown in (b). Bars represent p values for the ACC difference (YOZ minus COZ). The ACC difference is statistically significant at the 95% confidence level when the p value is less than 0.05, which is denoted by red color