Fig. 5. Environment-standardized GGE biplot of grain yield of 18 maize hybrids (H1-H18) grown in 266 environments over three years, stratified by state. Percent of the total GGE variation explained by the main two principal components in parentheses. PA: Pennsylvania, MO: Missouri, IN: Indiana, KA: Kansas, IA: Iowa, NE: Nebraska, MD: Maryland, DE: Delaware.