Fig. 2. Locus of injection current and Ca2+conductance (A ) or volatile anesthetic concentration (B ) where sustained oscillation is not possible for the Morris–Lecar barnacle muscle fiber model. As described in the text, the plot in (B ) was created from the data in (A ) assuming that halothane decreases Ca2+conductance according to the Hill equation where an halothane concentration of 0.85 mm deceases Ca2+conductance by 50% and with a Hill coefficient of 1.5.