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USEPA's best fitting dose-response model

This figure shows USEPA's best fitting dose-response model, which has a line that goes essentially strait up at the lowest doses then turns right essentially at a right angle for practically no slope over almost all cumulative exposures. This figure also shows that USEPA's second choice, ultimately selected dose-response model that results in an overall supralinear dose-response, with a line of extremely steep slope over low exposures that sharply turns to the right to have a remarkably low slope over higher exposures that are not extremely low.