Fig. 7.

Progression of the leaders for three independent fingers in two distinct experiments. Time t = 0 is taken at the beginning of the finger formation and not at the removal of the stencil. The symbol / / denotes the progression parallel to the initial edge (open symbols), the symbol ⊥ is used for displacements perpendicular to this initial edge (solid symbols). Leaders thus progress mostly perpendicularly to the initial wound edge at constant velocity.