It is seldom obvious which values of R should be computed at the highest level. Thus, in careful work there is the tendency to compute more points than necessary, leading to reduced efficiency. We seek to construct a dataset that yields results that are not sensitive to the choice of guiding potential. Thus, we compare the potentials, E1(R) and E2(R), obtained by using eq. ( ) with two guiding potentials, g1(R) and g2(R), in turn. The value of R with the largest discrepancy in energy, |𝐸 𝑅 𝐸 𝑅 |, is a logical choice for the next highlevel point. We illustrate the technique using the C2 molecule and the CASSCF and MRCI+Q guiding potentials, described above, as g1(R) and g2(R), respectively. The high-level method is CCSDT(Q)/aug-cc-pwCV Z (see Computational Details).