Error" (ME) approach and serves as a lower bound on the quantitative accuracy possible with the generated trial wave functions. In particular, we compare DVS selection against ME selection over six subsets of the generated active spaces. The first two subsets are the single parametrizations (λ=1) of APC with N = 4 and N = 8, which shows the accuracy of the APC approach alone without the use of the DVS or ME schemes. As is seen, neither choice of N produces satisfactory results when λ is fixed at one, with NEVPT2 MAEs of roughly 0.5 eV and many large outliers.