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Growth in the number of significant auxiliary basis expansion coefficients 
, as defined by Eq. 3, for three metrics and two drop tolerances, 10–6 (Left) and 10–9 (Right). See the Fig. 6 legend and the text for additional details. At 10–9, growth in the number of significant 
is nearly quadratic in the Coulomb metric, but linear for long chains in the other two metrics.
