Figure 2From: Entrainment of marginally stable excitation waves by spatially extended sub-threshold periodic forcingPhase portraits of the system at x = L/2 for T 0 = T end = 30 (dashed contour) and T 0 = 60 (solid contour). Nullcline of u is given by thick N-shaped line. Dashed and solid lines with intercepts at v r = 0.23 and v r = 0.16 are nullclines of v for T0 = 30 and T0 = 60, respectively.Back to article page