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Isobologram for the simultaneous administration of ketoprofen and neostigmine (A: intraperitoneal; B: intrathecal) and paracetamol and neostigmine (C: intraperitoneal; D: intrathecal). Ordinates of intraperitoneal (i.p.) and intrathecal (i.t.) administration are on different scales. Symbols as in Figure 1.
