Fig. 1
From: Theory of synergistic effects: Hill-type response surfaces as ‘null-interaction’ models for mixtures
Hill (green), Colby (red) and experimental (blue) mortality curves for pyrethroid mixtures, together with the Hill response surfaces (cyan). Mortality in %, doses in μ g/cm 2. a permethrin + etofenprox (antagonistic) b permethrin + cypermethrin (antagonistic) c cypermethrin + etofenprox (synergistic); d-f Contour plots of differences between Hill- and Colby-surfaces (in %) for a, b and c. Dashed lines indicate the respective EC 50 values