Try decreasing the step size in the numerical method. The stoichiometry of the (Al)13 is unusual and taking normal steps toward convergence probably causes oscillation. KNOBS -step 2 -pe 2 David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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