Figure 1.

Differences between the values of W_∞ and W_∞^′ computed with hPC and mPC formulas and the corresponding W_∞ and W_∞^′PC data (ΔW_∞ = W_∞^method – W_∞; ΔW_∞^′method = W_∞ – W_∞^′PC) for the harmonium atom at various values of the confinement strength ω. For reference, some available accurate SCE values are also reported.⁷⁰