Figure 3. Onset time as a function of molar potency. The upper regression line and the open circles represent the time to 90% of peak effect (y =-0.386x + 1.888; R²= 0.977). The lower line and the solid circles represent onset time to 50% of peak effect (y =-0.401x + 1.655; R²= 0.984). See Table 3for more information.