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Correlations (a), (c) and differences (b), (d) of electrostatic solvation energies by the MG solver on GPU and on CPU for the protein test set. The convergence criterion was set to 10−4 in (a) and (b) and 10−6 in (c) and (d). The linear regression slopes are 1.00016 and 0.999997, respectively. The asymptotic standard errors are 0.0024% and 0.000025% for the 10−4 and 10−6 criteria, respectively.
