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Cummulated frequency of Model Deviation Ratios. (MDR) of binary mixtures of pesticides (n = 195), metals (n = 20), and antifoulants (n = 103). The hatched interval where 0.5≤MDR≤2 defines the mixtures that deviates less than two-fold from a Concentration Addition predictions. Mixtures having MDR values<0.5 are termed antagonistic, while mixtures with MDR values>2 are synergistic.
