Fig. 2. Nonlinear regression curves of the stress-strain measures for each residue type, two subsamples per hybrid, >4,000 stress-strain data points per hybrid. RW = Bt⁺ containing Cry3Bb1 protein active against corn rootworm (DKC60–12); CB+RW = BT⁺⁺ stacked, Cry1Ab proteins active against European corn borer and Cry3Bb1 protein active against corn rootworm (DKC60–14); Base = Bt^–, base genetics containing no Bt genes (DKC60–15), CB = Bt⁺ containing Cry1Ab protein active against European corn borer (DKC60–16).