Poincaré maps representing the laminar phase evolution I_n+1 = f(I_n): (a) theoretical evolution of a single laminar phase with L = 7; (b) theoretical points of three successive L = 7 laminar phases considering relaminarization using the baker’s transformation. The relaminarization process consists of cutting the blue curve f(x), taking the upper part, stretching it and folding it back: explaining then the differences between (a) and (b). Experimental points for six consecutive cycles of L = 7–8 laminar phases are plotted for comparison.