Standardized README to Markdown format

README.md

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+# References
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+Hines, Michael and Peter Shrager (1991). A computational test of the requirements for conduction in demyelinated axons. *J. Restorative Neurology and Neuroscience*. 3 81–93.
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+This example produces figure 3 of the paper. The implementation is derived from the paper and is not based on the original code. Discrepancies in minor quantitative details are those that depend on a few tenths of a degC changes in celsius. The current version of NEURON (v5.2) does not allow use of secondorder=2 in the presence of the extracellular mechanism.
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+2025-05-27 – Standardized to Markdown.