Fig. 2. Mean grain yield of all population crosses involving either EliteB C₀ () or C_A (•), and per se grain yield of either EliteB C₀ () or C_A () populations over six environments. Dashed lines represent the response of the C₀ population and solid lines represent the response of the C_A population over a range of environments. Environmental index is the grand mean grain yield of the experiment in that environment.