Simulates the Barkley model of an excitable medium, see: http://www.scholarpedia.org/article/Barkley_model Derived from FitzHugh-Nagumo model and Hogdkin-Huxley model. TIFF images can be viewed with external tools such as Fiji / ImageJ (http://fiji.sc/Fiji) or BioView3D (http://www.dimin.net/software/bioview3d/). The latter also reads the OME header for 3D, 4D and 5D images. VTK filed can be viewed with external tools such as ParaView (https://www.paraview.org/).

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(1/e)*u*(1-u)*(u-((v+b)/a)) + Du*(0.5*u_n-0.5*u) u-v 1 2