Fig. 2. The GGE biplot based on maize yield of 12 populations and their crosses in eight environments. Crosses among populations were designated by the letters assigned to their population parents: A, B, C, D, E, F, G, H, I, J, K, and L for Tuy, Viana, Lazcano, Basto/Rastrojero, Rastrojero, Enano levantino/Hembrilla, Bade, Lacaune, Esterre, Ain, Millette du Lauragais, and Millete Montagne Noire, respectively.