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. Author manuscript; available in PMC: 2014 Aug 26.
Published in final edited form as: Psychopharmacology (Berl). 2010 Dec 21;213(0):489–497. doi: 10.1007/s00213-010-2136-9

Fig. 4.

Fig. 4

Ratios of observed (experimentally determined) ED50 values (Zmix) and expected (additive) ED50 values (Zadd) for different proportions of drug mixtures. Ordinates, ratio of Zmix and Zadd. Abscissae, proportion ratios of each pair of the drug