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The term "potency" refers to the EC 50 value. The lower the EC 50 , the less the concentration of a drug is required to produce 50% of maximum effect and the higher the potency. The EC 10 and EC 90 concentrations to induce 10% and 90% maximal responses are defined similarly.
The "walkline" is the imaginary line some distance away from the inner edge on which people are expected to walk. The building code will specify the distance. Building codes will then specify the minimum tread size at the walkline.