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Genotype-by-trait table across selected environments
Under the main menu 4-Way, click Geno by Trait table in Some Environments. A form containing two list boxes, labeled as "to Select" and "to De-Select", will appear, allowing you to select any one or any number of the environments (year-location combinations).
After the form is closed, a biplot will appear that is based on the genotype by trait two-way table with values averaged across the selected environments.
See this page for interpreting a genotype-by-trait biplot.