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README for smpbe APBS example

Due to numerical stability issues SMPBE method is currently disabled. We apologize for the inconveninece.

The example input files included in this directory solve the Size Modified PBE as described by Chu V, et al. Biophys J, 93(9):3202-9, 2007(doi:10.1529/biophysj.106.099168. SMPBE does not assume ions are infinitely small as in the standard PBE. This method uses finite ion sizes through a gas lattice formulation.